Neuralink, Elon Musk's brain implant company, valued at $5B.

Elon Musk's brain implant company Neuralink is now valued at around $5 billion, up from $2 billion two years ago, following an influx of new investors since a human trial on its brain chip was approved by US regulators in May. The company's chip is designed to treat obesity, autism, depression, and schizophrenia, and could also be used for web-surfing and telepathy. However, experts believe it could take several years before the company will receive clearance for commercial use. Neuralink has faced scrutiny from US lawmakers and government agencies over safety and animal welfare concerns.