This week's circulars

Videos

What it's like to climb up a 270-foot wind turbine

Get an exclusive and entertaining look inside of a wind turbine. Simon and Andy are your guides as they travel 270 feet up to the top of a turbine at the National Wind Technology Center in Golden, Colo.
U.S. Department of Energy
What it's like to climb up a 270-foot wind turbine 3:46

What it's like to climb up a 270-foot wind turbine

National Geographic features KC's Avery Jackson, a transgender girl 1:36

National Geographic features KC's Avery Jackson, a transgender girl

Students rap and dance their way through long division problems 1:01

Students rap and dance their way through long division problems

'Hidden Figures' cast talks about the 'human computers' at NASA 3:24

'Hidden Figures' cast talks about the 'human computers' at NASA