Place the cardboard over the glass. Press your hand on the cardboard and flip the glass upside down. Slowly remove your hand.
You have an "immune army" that needs to practice fighting. The friendly bacteria on your skin (the "good guys") teach your body how to defend itself from the "bad guys" (viruses). It is like a sparring session for your white blood cells. junior muy interesante
Cats have a "righting reflex." When they fall, their flexible spine twists in two phases. First, they turn their head to see the ground; then, their body follows like a gymnast doing a half-turn. In less than one second, they use the laws of (the same force that makes an ice skater spin faster when they pull their arms in) to land on their paws. Place the cardboard over the glass