About 5 years ago I switched to eating primarily whole organic foods and my children seem to be more alert, happy, sleep better and also seem to do better in school.

大约五年前，我开吃转吃纯有机食品，我的孩子们因此而看起来更机敏、快乐、睡得更香，而且学业更进步。

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Then be alert. Think about what they need from you.

然后保持机敏地思考他们需要你的什么帮助。

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This is not about creating alarm but helping children be more alert and careful.

这不是关于制造惊慌，而是帮助儿童更加警惕和谨慎。

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Now that over half of the United States owns a smartphone, and nearly 20 percent of consumers report that device to be their primary camera, everyone should be on the alert about the privacy of their videos and pictures.

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If Shopobot can work out when a retailer is likely to drop their prices in order to stimulate demand then it can alert you to be thinking about shopping at that time.

FORBES: Shopobot: a New Toy for Economists

Properly equipped refrigerators, for example, would be able to alert users whenever their stock's about to expire, simply by scanning the tags.

ENGADGET: NutriSmart prototype embeds RFID tags directly within food, traces your lunch from start to finish (video)