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‘We Are All Shocked’: Warming Waters Bring a Stinging Sea Slug to Spain’s Coasts

The blue dragons, which pack a ferocious sting, have led to several beach closures. Experts say it’s a worrying sign of the warming of the Mediterranean.

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A.K. Best, Master of the Art of Fly Tying, Is Dead at 92

His meticulously crafted, lifelike designs were said to have “shaped the soul of modern fly fishing.”

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Steven Cook, a Former Chemical Industry Lawyer, Now at E.P.A., Wants to Change PFAS Rules

A Trump appointee has proposed rewriting a measure that requires companies to clean up “forever chemicals,” documents show. The new version would shift costs from polluters.

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A Casualty of Trump’s Tariffs: India’s Nascent Solar Industry

The full weight of a 50 percent tariff on Indian goods took effect this week, undercutting one of the country’s most promising markets for solar exports.

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Southwest Monsoon Brings Dust Storms and Rain

The season for strong storms came late. This week, it has led to travel delays, a snarled start to Burning Man and a recharged waterfall in Yosemite.

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Uncovering the Genes That Let Our Ancestors Walk Upright

A new study reveals some of the crucial molecular steps on the path to bipedalism.

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Rainer Weiss, Who Gave a Nod to Einstein and the Big Bang, Dies at 92

He shared the Nobel Prize in Physics for his work on gravitational waves, which helped confirm Einstein’s general theory of relativity and how the universe began.

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SpaceX Starship Test Launch: How and When to Watch the 10th Test Flight

After two consecutive scrubs, the Starship vehicle began its 10th test flight as Elon Musk’s company aims to overcome earlier setbacks.

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China Finds Buyers for Surplus Solar: Africa’s Energy-Hungry Countries

Overproduction in China has led to slashed prices, and buyers on the continent are taking advantage to sharply increase investments in clean energy.

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How the Pygmy Sea Horse Lost Its Snout

The genome of a small, remarkable sea horse offers a surprising lesson in nature’s creativity.

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