1. Hack harms bitcoin The price of bitcoin fell sharply this week after South Korean exchange Coinrail — regarded as something of a small player in the cryptocurrency world — was hacked. The attack spooked investors, causing a 10% drop, which sent bitcoin to two-month lows. Other digital currencies also recorded losses: ripple, ethereum and bitcoin cash fell more than 11%. The person behind the hack stole about US$40m, though about 80% of that has been frozen by police in South Korea.

2. Musk’s fiery start Elon Musk delivered 1,000 flamethrowers to customers, the first batch of his stunt to fund The Boring Company, a transportation venture that hopes to dig tunnels to ease traffic congestion. The company sold 20,000 units — $10m worth — in five days. Officially called "Not-a-Flamethrower" for legal reasons, the devices were first handed to buyers at a party in California, where they could also be tested — by roasting marshmallows, for example. People, however, can’t be expecte...

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