How to check in 20 seconds:
1. Raise both arms straight out in front of you, palms up, and close your eyes for 10 seconds. If one arm drifts down on its own or turns palm inward - that is it. One side of the brain is weakening.
2. Squeeze both hands into fists and compare the strength. One noticeably weaker - the same signal.
This made my day. A baby chimp being flown to safety after being rescued from poachers in the Congo. The way the pilot treats the little one is so heartwarming