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Hubble Servicing: Big Repairs, Tight Constraints
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Deco, from desk to dial
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The Hop Shoot Circles as Twiners Seek Supports
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A Garden Between Tides

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Home EV Chargers in 2026: Connector, Installation and App Costs
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Silverspot and the Other End
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The Hidden Repair Kit in Roman Concrete
Transcript
These lime-rich pieces were once dismissed as sloppy mixing.
Research points to hot mixing: adding reactive quicklime while making the mortar.
If a small crack crosses a lime fragment, water can enter.
Calcium dissolves into the water. New calcium carbonate can form inside the gap.
In Roman-inspired lab samples, cracks stopped leaking within about two weeks.
The recipe and conditions matter. This is about small cracks in specific materials.
The surprise is not just what the Romans built. It is what happened inside.
Attribution
Photographs: Livioandronico2013 (CC BY-SA 4.0) and MM (public domain), via Wikimedia Commons; research: Seymour et al., Science Advances (2023), MIT News, and Vaserman et al., Nature Communications (2025); original 3D teaching animation and editing: Ask Pandi; narration: ElevenLabs (George). Photographs are cropped/animated, with original sources and licences retained. The 3D cutaway and lab comparison are explanatory illustrations. Adapted Pantheon photograph retains CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/ [1] [2] [3] [4] [5]
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The well that put a stone coat on a hat
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- This hat seemed to turn to stone
At Knaresborough’s dripping well, Victorian visitors saw everyday objects hanging beneath mineral-rich water.
- The water was building a shell
Minerals left by the dripping water formed a hard coating around each object, following its shape.
- A stone coat, not a stone hat
The shape stayed familiar because the deposit formed around it. The apparent transformation was encrustation.
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Lobo, King of Currumpaw
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Some ants turn their own bodies into food stores
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- The pantry is alive
Some ants store liquid food inside their own bodies. Their swollen abdomens turn living workers into the colony’s food reserves.
- These workers hang from the ceiling
Storage workers cling to the roof of a nest chamber. Other workers bring them food, filling the enlarged crop inside the abdomen.
- One colony. Different jobs.
Some workers collect the food; others store it. The colony’s supply is held in the bodies of its own workers.
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