@penguin42 penguin42: The link you posted is inaccessible from some users.
Why not suggest alternative link next time? So my friend can read the webpage

Alternative:
https://web.archive.org/web/https://www.nature.com/articles/s41586-019-1493-8.epdf?referrer_access_token=dJtKU5-3Y6YlQxqOLq3qBtRgN0jAjWel9jnR3ZoTv0PkGJauTlV6nl-UH4T7DYZYOYy4e1KJEyhDRIzhlaA-pIRlOQhoYTDEpR-3IoMsO3W3zwEmTjr4NFcZ4tW4PlumxwJ1qX7lTjb9lfQocw_mgVkkeFrFY9Kl4EKOvxm-xae-XvXHflEBGaERQ7jrH4AwI7kkeaZKXiIySNS8D4NL3jxNTBlig6UUdl8wEg0C0i1bA-VKCLmkovapINXGYvIVdukDBtNmcd4UU-1SAHC1af03Fk5XhXzqQRrIwKIc3HFjvgzaxfChtdhsJmux8QG6Z_iV9maLiikyBvowsnco0PaBLnoPs9v4XPuGNZOfNXmorNqz7uDM3oiKeSyBb8u1&tracking_referrer=www.sciencenews.org

Cloudflare domain: nature.com
Why: https://notabug.org/themusicgod1/cloudflare-tor