The decentralized, open source Mastodon social network has been invaded by Gab, a pro-Nazi platform.

Gab moved to Mastodon servers recently, leading Mastodon admins and developers struggling with the question whether to ban Gab.

There shouldn’t be any struggle. Free speech includes the right – even obligation – of the owners of platforms to block speech they find hateful. That’s a particularly easy decision for Mastodon, which is not Facebook- or Twitter-scale.

Adit Robertson on The Verge: How the biggest decentralized social network is dealing with its Nazi problem

“The dead rising from the grave! Human sacrifice, dogs and cats living together, mass hysteria!”

A new technique uses space-based satellite surveillance to prevent bridge collapses, by detecting defects smaller than the thickness of a dime.

The new technique uses computer modeling and high-resolution satellite images to detect subtle shifts in a bridge’s structure that could indicate that it’s starting to fail. Some of the changes are so tiny that they could be undetectable during traditional visual inspections, the scientists say. The new technique uses computer modeling and high-resolution satellite images to detect subtle shifts in a bridge’s structure that could indicate that it’s starting to fail. Some of the changes are so tiny that they could be undetectable during traditional visual inspections, the scientists say.