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"But Chia's replacement for bitcoin's energy-intensive "proof of work" system, called "proof of space and time", instead requires users to devote massive amounts of hard drive space to generating and storing random numbers, with rewards doled out to those with the most space used up"

"The Purdue researchers have created Electro-Quasistatic Human Body Communication (EQS-HBC) which uses low-frequency, carrier-less broadband transmission, and so keeps the signal almost entirely within the human body. That means data from pacemakers and other implantable medical devices would only be readable a handful of centimetres outside the wearer."

"Increasing numbers of implantable medical devices are now gaining internet connectivity, giving doctors the ability to monitor patients health remotely, and even update the devices to tweak a treatment plan. Unfortunately, that flexibility offers a way for hackers to hijack that hardware, and even potentially make changes to the way the devices work. While so far no attacks have been successful, proof-of-concept attacks have been available for years"

"Take Yoti, for instance: the company provides a range of age verification services, partnering with CitizenCard to offer a digital version of its ID, and working with self-service supermarkets to experiment with automatic age recognition of individuals. John Abbott, Yoti's chief business officer, says the system is already as good as a person at telling someone's age from a video of them, and has been tested against a wide range of demographics - including age, race and gender - to ensure that it's not wildly miscategorising any particular group. The company's most recent report claims that a "Challenge 21" policy (blocking under-18s by asking for strong proof of age from people who look under 21) would catch 98% of 17-year-olds, and 99.15% of 16 year olds, for instance."

"Halifax's system, which is currently at the proof-of-concept stage, uses a piece of wearable technology known as the Nymi band; it monitors and stores a user's heartbeat via an electrocardiogram (ECG). Users must wear the Nymi on one wrist, and touch its top sensor with the opposite hand for it to work. The Nymi pairs with a smartphone via Bluetooth, using a companion app for Windows, Mac, iOS and Android. Removal of the wristband invalidates biometric authentication."