Notes: This figure plots weekly averages of log price and log computing power (log hashrate) of Bitcoin and Ethereum over the period from August 2015 to January 2019. We normalise both time series by subtracting their mean and dividing by the standard deviation.
Co.DesignCo.Design90% of Rotterdam is below sea level. So the city built an office building that floatsCo.DesignThese ingenious floors use 70% less concrete and 90% less steelCo.DesignScience proves it: Most NFTs are worthless

FACEBOOK WHISTLEBLOWER GOES PUBLIC: “The former Facebook Inc. employee who gathered documents that formed the foundation of The Wall Street Journal’s Facebook Files series said she acted to help prompt change at the social-media giant, not to stir anger toward it,” the Journal’s Jeff Horwitz wrote in a profile of Frances Haugen, a former product manager hired to help protect against election interference on the platform. She “said she had grown frustrated by what she saw as the company’s lack of openness about its platforms’ potential for harm and unwillingness to address its flaws. She is scheduled to testify before Congress on Tuesday. She has also sought federal whistleblower protection with the Securities and Exchange Commission.”
Since the first digital currencies were devised after the financial crisis, $2.3tn has been invested in them. But how do they, and other assets transacted on blockchain technology, actually work? And what risks do they pose? Read our explainers