A round temptation, red or green, keeps the doctor away, a teacher's reward, gravity's muse, and a tech titan's logo.

When the wheel was invented, it caused a...

I come in pairs but I’m not shoes, I sparkle and add color to you. I near your head, but you'll never hear a word said. What am I?

Used by climbers and lifters, even acrobats at height. Or snapped with a string that's pulled very tight. I can write in many colors, the most common is white.

I don't eat light, yet I burn fat. Forget me not, or I will attack.