Have a geek moment with Beth Wilson, host of STEM in 30. She's taking a closer look at the spacecraft that helped John Glenn become the first American to orbit the Earth. Why were there eye charts in the spacecraft? Beth explains why.
Have a geek moment with Beth Wilson, host of STEM in 30. She's taking a closer look at the spacecraft that helped John Glenn become the first American to orbit the Earth. Why were there eye charts in the spacecraft? Beth explains why.