Donald Yeomans

Feb. 22, 2013

Russia Meteor Renews Focus on Asteroid Threats

Astronomers weigh in on how to keep the planet safe from near-Earth objects.

meteor, asteroid, space junk, collision, space rock, debris, explosion, planetary defense, near-earth objects

Dec. 28, 2007

Asteroid Heading Toward Mars

An asteroid has a 1-in-75 chance of hitting Mars in late January. Find out why astronomers are on the edge of their seats.

asteroid space impact mars

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Michael Pollan Talks Plants and Food

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Teacher Feature: Ethnobotanist Tom Carlson

\tScience Friday salutes a great science teacher. "Office hours are some of my favorite hours of the week," says Tom Carlson, a medical doctor, ethnobotanist, and instructor of 1700 students annually at the University of California, Berkeley. One of Carlson's former students, SciFri associate senior producer Christopher Intagliata, told us that Carlson's class was the reason he got into science (listen here).

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