People who believe they contribute to society are more likely to vote and engage in politics. They were also more likely to donate to and volunteer for political causes compared to individuals who saw their contribution to society as smaller.

· · 来源：shenzhen资讯

Performance tracking

Ambient’s dedicated alarm clock offers many of the conveniences of your smartphone alarms — highly customizable alarm schedules, a library of soundscapes and noise masks and even Bluetooth so you can connect earbuds. There’s no subscription, it sounds great and sleep insights are supposedly incoming. However, $250 is a lot. Check out our full review.

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Mathematical animations for the web.

10 edge cases (boundary values, max carry chains)

Brigitte B