Crabs' camouflage tricks revealed

Crabs from a single species rely on different camouflage techniques depending on what habitat they live in, new research shows.

Slack: Some accounts mistakenly deactivated during update

Slack says it mistakenly deactivated accounts for some of the users of its work-focused messaging service this week as it implemented a system update to comply with U.S. economic sanctions and trade embargoes.

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