A new study shows that the sediment on the seafloor in the middle of the South Pacific appears to have the fewest living cells of any place on the planet.
GAZE AT THE STARS: See the moon, planets, stars galaxies and more on Saturday at a free public viewing program at UC Berkeley's Laawrence Hall of Science. There's even a special visitor this weekend: Mars! The gazing starts at 8 p.m.
WATER PLANT TOUR: No joke, there's actually a tour of the Santa Clara Water Pollution Plant. Where does the water go when you flush, rinse or drain? Find out the ins and outs of the largest wastewater treatment facility on the West Coast. The tour starts at 1 p.m.
RUN LIKE THE WIND: If you'd like to feel healthy after your long work week, try going on the Bridge to Bridge 12K and 7K Run/Walk on Sunday morning. Start in front of the Ferry Building at 9 a.m. and enjoy "America's Most Beautiful Run".
WALK & WAG: Go for a walk with your dog and raise money for the Humane Society Silicon Valley at the same time. The 5k route starts and ends at the shelter's community center. There's plenty of entertainment on tap, including a dog agility demonstrations and opportunities to get your four-legged pal involved too.