A quiet finish for U.S. stocks masked big swings underneath the surface. The S&P 500 rose 0.1% Tuesday after swinging between ...

Plus, in this week’s Installer: a new Mario Tennis, Sony’s great new buds, a wild time-travel movie, and much more.

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Python -O won’t magically make every script faster, but in the right workloads it’s a free win—here’s how to test it safely.