Why Christmas Island red crabs migrate to the sea

Millions of Christmas Island crabs migrate to the sea

Every year, millions of red crabs on Christmas Island walk from the forest to the ocean to reproduce. Around high tide during a particular phase of the Moon, females release their eggs into the sea. Young crabs later return to land.

The seven-day week does not match sky cycles

The seven-day week has continued without interruption for millennia, even though it does not match a cycle of the Sun or Moon. Calendars can combine this steady social rhythm with cycles tied to either one.

Most cancer deaths happen after the cancer spreads

Cancer cells can leave the original tumor and grow in other parts of the body. This process is called metastasis. Most cancer deaths are caused by cancer after it has spread rather than by the original tumor alone.

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Why Christmas Island red crabs migrate to the sea

Millions of Christmas Island crabs migrate to the sea

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