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Grace Holloway

Health & Science ReporterBoston, MAVerified

Grace has written about medicine and science for two decades. Her favorite stories start with a question a reader sent in.

24 articlesUpdated June 22, 2026

Your Smartwatch Flagged an Irregular Heartbeat. Here’s What That Alert Can and Can’t Tell You

Heart-rhythm alerts on watches can catch real problems, and miss others. Cardiologists explain how to read them.

Grace HollowayJune 22, 20266 min read

One of the smartest animals on Earth is built nothing like us.

Grace HollowayJune 21, 20266 min read

Fitness is built while you recover, not while you train.

Grace HollowayJune 16, 20266 min read

Fungal networks connect roots — but scientists are still debating what that means.

Grace HollowayJune 15, 20266 min read