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HumansRembrandt’s eye saw no depth
The 17th-century Dutch artist Rembrandt lacked stereoscopic vision, an optical analysis of his self-portraits suggests.
By Ben Harder -
Health & MedicineHepatitis B vaccine linked to MS
People who develop multiple sclerosis are more likely than others to have received a hepatitis B vaccination in recent years.
By Nathan Seppa -
Materials ScienceHeat-controlled implant delivers insulin on demand
The field of drug delivery is literally heating up, with the development of a new polymer implant that releases insulin in response to changes in temperature.
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Astronomers and physicists seem to speak of black holes as though they took matter completely out of the universe.