2017 — perspective and rumors https://waitbutwhy.com/2017/04/neuralink.html

2020 — working prototype https://vc.ru/future/154015-eto-kak-fitbit-v-cherepe-ilon-mask-pokazal-obnovlennyy-neyrointerfeys-neuralink-besprovodnoy-chip-link-v-forme-monety