What went wrong with the Hubble Space Telescope?
After the Hubble Space Telescope launched in 1990, scientists discovered that its main mirror was slightly misshapen. Astronauts fixed it with corrective optics in 1993.
What is the eye's blind spot?
Every eye has a blind spot where the optic nerve connects, but your brain fills in the missing part, so you don't notice it.
Did Vermeer use a camera obscura?
Some experts think Johannes Vermeer may have used a camera obscura.
What did Newton do during the plague?
While Cambridge University was closed during the plague in 1665 and 1666, Isaac Newton made major discoveries in calculus, optics, and gravity.