begins with an e-l, end with vator. [laughter] elevator. isn't that right? elevator. high-rises. could you imagine living on the 32nd floor and having all stairs? so the fact that the elevator came along changed the way cities are built. now, we go straight up, huh? high-rises. we're gonna talk about motion today. we're gonna talk about a lot of definitions. first definition for motion is how fast you move. that's speed. so speed. we defined speed to be-- speed is measured in, like, miles per hour, so it's distance compared to time. so speed is simply distance compared to time. if i travel 60 miles and i do it in a time of 1 hour, what's my overall speed? 60 miles per hour. try it. 60 miles an hour. 60 miles an hour. okay? let's suppose i go 70 miles in 1 hour. what's my speed? 70 miles per hour. 70 miles per hour. let's suppose i go 100 miles and it takes me 2 hours. what's my speed? 50 miles per hour. 100 miles for 2 hours or 50 miles per hour. right? can you do metric units? let's suppose i go 60 kilometers and it takes me 1 hour. what's my speed? what is it, gang? 60 kilomete