Hedgehogs of the Sea

Sea urchins might just look like a simple spiny ball. But did you know those spines are connected with ball-and-socket joints—and if a spine is broken off, it can regrow?

And that’s not all—sea urchins have five teeth to bore holes into rocks. These teeth are made of soft crystals—so how can they grind up rock?

Well, harder crystals are located at the tips, acting like sandpaper. As the teeth wear down and break off, new jagged edges continue the work.

Scientists hope this incredible design will help them make blades that don’t need sharpening!

When scientists look to nature for inspiration, they’re copying the Creator God.

Dig Deeper

• Sea Urchins—The Daily Grind
• God Invented It First