Understanding how ‘spiders’ form on Mars’ surface

For the past 20 years, scientists have been examining mysterious “spiders” on Mars. They’re not actual arachnids, but rather dark blobs that branch into spider-like patterns in the Martian soil. It’s unlike anything that takes place on Earth. But researchers in England have now found a way to recreate the environment — and the spider-like features. The World’s Marco Werman has the details.