31.
32.
Making Roman concrete produces as much CO2 as modern concrete
(arstechnica.com)
33.
Hill Space: Neural nets that do perfect arithmetic (to 10⁻¹⁶ precision)
(news.ycombinator.com)
34.
Bunker Busters probably failed to penetrate Iranian concrete
(news.ycombinator.com)
35.
How I uncovered a potential ancient Rome wine scam
(news.ycombinator.com)