Brent and Michael's Secret Travel Hacks, Part 23!

Use antiperspirant correctly, insure your senior self, get a year of the New York Times for $10, learn everything about rental car insurance, and renew your passport early!

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Two travel hacks — now with cool Portuguese tile!

Still another edition of our unusual travel hacks!

For other travel hack columns, go to Part Ten and Part Eleven and Part Twelve and Part Thirteen and Part Fourteen and Part Fifteen and Part Sixteen and Part Seventeen and Part Eighteen and Part Nineteen and Part Twenty and Part Twenty-One and Part Twenty-Two.

Here are the latest hacks:

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Traveling with kids and you forgot a thermometer to find out if they’re feverish? Not to worry! Feeling their forehand with your hand is as accurate — or more accurate — than most thermometers anyway.

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Lots of folks have written in to ask about travel insurance for folks older than 72 (which many companies refuse to insure). Allianz has plans for all ages: one plan goes up to 188 days, and another goes up to 365 days.

To get the cheapest plan, put in “$1” under “Total Trip Cost,” and you’ll end up with a Trip Cancellation coverage of $500 — the minimum. Also, they ask you to declare a single destination country, but you will be covered in all destinations that are not specifically excluded. (Before purchasing, confirm all details with the company.)

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Apply antiperspirant before you go to bed. You can apply it in the morning too, but experts agree that it works much better if you’re not already sweating too much, which makes bedtime the ideal time. The following day, you’ll be dry as a desert.

And if your body has a bad reaction to plugging your sweat glands (as mine does)? For a basic deodorant, I find there’s nothing better than plain old Mennen Speed Stick.

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What insurance do you really need on a rental car? And how good is the rental insurance that comes with your credit card?

Here is everything you need to know. It’s complicated — and not what I expected when I started researching this.