31.
32.
Hundreds plunge into Chicago River in first open-water swim in nearly a century
(news.ycombinator.com)
33.
35.
38.
Form’s Smart Swim 2 goggles add heart rate tracking
(theverge.com)
39.
40.
The fish kick may be the fastest subsurface swim stroke yet (2015)
(news.ycombinator.com)