State of K
State of K is a platform for creating, improving, and sharing lists of all the studies that examine a question.
Once you create a list of studies, our algorithms help you understand the state of knowledge on your question.
The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

Do gun buyback programs reduce gun violence?
11 Studies (1994 to 2016) List by: XJackson (78)
The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

Why do legislatures adopt voter ID laws?
6 Studies (2013 to 2017) List by: JFranks (92)
The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

Do obese children become obese adults?
2 Studies (1993 to 1997) List by: Anonymous
The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

How do I overcome my fear of childbirth?
25 Studies (1998 to 2018) List by: Anonymous
The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

How can I increase breast milk expression?
12 Studies (1996 to 2017) List by: Anonymous
The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.

The colors correspond to the answer that each study gives to the question, ordered by publication year:
YesNoMixed resultsInsufficient evidence to answer
For example, if you see an unbroken span of green (meaning "Yes"), followed by mostly purple (meaning "No"), interspersed with bits of orange (meaning "Mixed results"), that means all of the earliest studies answered "yes" to the question, but the consensus of later studies shifted to answering "no", while a few studies found "mixed results".
* Colors representing answers from studies that are literature reviews or which were published in what we deem to be highly regarded sources take up double the amount of space they otherwise would.
When answers are not available, the colors correspond to information about each study:
Study was published in a highly regarded sourceStudy is a literature reviewNo study info to report
* We only generate answers for questions that are capable of being answered "yes" or "no". For other questions, read the study summaries included in the study list to understand the state of knowledge on that question.