Gravity Is Not a Force, It’s a Shape
▶ DRILLA probe coasts around a planet with its engines off, never steering — yet its path keeps curving. Newton says an invisible force reaches out and pulls it in. Einstein says there's no force: the planet curves the spacearound it, and the probe simply goes as straight as it can — and on curved space, "straight" wraps into "around." Same path, two stories — and Einstein's needs no force, and explains what Newton couldn't. Gravity isn't a pull; it's the shape of space and time. Use the Explain it for a kid / a grown-up switch to set the depth.
The big idea — gravity isn't a pull, it's a shape. A planet bends the space (and time) around it, and anything coasting freely just follows the straightest path it can — which curved space wraps into a fall or an orbit. The probe never steers; the world it moves through is bent. (The bending grid is a cartoon — real space-bending is in more dimensions than we can draw, and for everyday gravity it's mostly TIME that's curved. But the idea is exactly right, and it's why an astronaut in orbit feels weightless: nothing is pulling them — they're just coasting straight.)