| | | By Jeffrey Kluger
Editor at Large |
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| About 40% of U.S. homes filter their water, and with all sorts of toxins lurking in reservoirs and wells, perhaps yours should be among them. But filters can range from simple pitchers to whole-house reverse osmosis systems—and from a few tens of dollars to thousands. Here’s what you need to know before you buy. | | | |  | 6 Ways to Give Better Gifts—Based on Science | Embrace the sentimental, opt for experiences over things, and don't overdo the personalization. |
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|  | Is Zinc Good for Colds? | Maybe—but it comes with drawbacks. |
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|  | 5 Ways to Survive the Holidays if You're a Scrooge | Reach out, be flexible about travel, let yourself feel sad, and set boundaries. |
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| | | If you were forwarded this and want to sign up to receive it daily, click here. Today's newsletter was written by Jeffrey Kluger and edited by Angela Haupt. | |
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