The Kharola Glacier, west of Lhasa Tibet Autonomous Region. Glaciers here were warmer over the past 50 years.

Nir Elias/Reuters/File

Study blames humans for most of melting glaciers

More than two-thirds of the recent rapid melting of the world’s glaciers can be blamed on humans, a new study finds.

Specks returned from space may be alien visitors

Scientists say seven microscopic particles collected by NASA’s comet-chasing spacecraft, Stardust, appear to have originated outside our solar system.

Latest Science headlines

Legalization blurs message to teens about marijuana

For most of their lives, middle and high school students have been lectured about the perils of marijuana. Now, the adults have done an about-face.

Cosmonauts launch Peruvian satellite

Spacewalking astronauts launched a tiny Peruvian research satellite Monday, setting it loose on a mission to observe Earth.

Researchers decry limits on drones

Scholars are warning the FAA’s rules on drones jeopardizes their work and undermines basic education.

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Ideas

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2014/08/14/BostonGlobe.com/Ideas/Images/IdeasRobots%20HR.jpg Can a robot be too nice?

Smart machines need the right “personality” to work well—and experts are finding the best choice may not always be what we think we want.

Instagram

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2013/12/17/BostonGlobe.com/Metro/Images/a4a68392593311e3a80a0a154a02c3a8_7-7210--90x90.jpg Boston Globe Instagram photos

A live stream of Instagram posts from The Boston Globe photo department.