New best story on Hacker News: Stacking concrete blocks is a surprisingly efficient way to store energy

Stacking concrete blocks is a surprisingly efficient way to store energy
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New best story on News: Google broke reCAPTCHA for de-googled Android users

Google broke reCAPTCHA for de-googled Android users 634 by anonymousiam | 224 comments on News. Related: Google Cloud fraud defense, the...