You're born with roughly 9,000 taste buds, and they're very good at regenerating — which is why you can recover the ability to taste just days after burning your tongue. But that can change as we age.
Some people are born with anosmia — the inability to smell. Others lose their sense of smell later in life. That makes it hard to taste food, detect threats, or even savor memories.
When it comes to curiosity, science writer Mary Roach describes herself as someone who is "very out there." Her new book, Grunt, looks at some scientific developments that help keep soldiers safe.
Scientists say they've identified the bacteria that emit that rank smell after a hard workout. Future deodorants might target that bad actor rather than blocking sweat glands or nuking all bacteria.
Our sense of smell isn't simply a powerful trigger. It's a draw to scientists — and to a flourishing subculture in Los Angeles, where amateur perfumers collect fragrances like others collect stamps.
The human nose may be able to distinguish more than a trillion different odors and fragrances, research hints. If true, our noses are much more discerning with smells than our eyes are with color.