PRIMETIMER on MSN

"No one has enjoyed you more than me": Sarah Michelle Gellar celebrates Freddie Prinze Jr.'s 50th birthday with sweet tribute

Freddie Prinze Jr. has turned 50 years old. Find out what Sarah Michelle Gellar said in her tribute for her husband on his special day.
PRIMETIMER on MSN

How can scientists measure the mass of dangerous asteroids? New spacecraft method proposed

New spacecraft techniques propose using CubeSats, laser rangefinding, and precise Doppler measurements to determine the mass of potentially hazardous asteroids during flyby missions.