5 Mind‑Bending Mysteries Science Still Can’t Crack
The Monarch Butterfly’s Impossible Navigation
Every year, millions of monarch butterflies travel up to 3,000 miles from Canada to a single small forest in Mexico – a forest none of them has ever seen. They use a built‑in sun compass and an internal magnetic map, but how their tiny brains coordinate both is still a total mystery. It’s like handing you a paper map and a watch, then expecting you to find a specific tree on another continent.
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