LIGO Scientists Detected A Third Gravitational Wave From Two Colliding Black Holes.

Drafts of tessellations…

Triphilia by Robin Scholz, Star/Flower, star side, by Lydia Diard.

June 8th is World Oceans Day - a day to celebrate the oceans that connect and sustain all of us. Our colleagues at the Biodiversity Heritage Library have been leading up to today with a series of blog posts  exploring historic publications that mark important milestones in the progress of marine bioscience research and ocean exploration.

Top image: Whale shark from  Illustrations of the zoology of South Africa… v.4 (1845) Middle top : radiolarians and jellyfish from Ernst Haeckle’s Kunstformen der Natur (1904) Middle bottom: giant squid from Cassell’s Natural History v.5-6 and cuttlefish from  Voyage de la corvette l'Astrolabe Mollusques and Zoophytes Atlas (1833) Bottom: deep sea fish from  Valdivia Expedition…1898-1899. Bd. 15, T. 1

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Many solids can dissolve in liquids like water, and while this is often treated as a matter of chemistry, fluid dynamics can play a role as well. As seen in this video by Beauty of Science, the dissolving candy coating of an M&M spreads outward from the candy. This is likely surface-tension-driven; as the coating dissolves, it changes the surface tension near the candy and flow starts moving away thanks to the Marangoni effect. With multiple candies dissolving near one another, these outward flows interfere and create more complex flow patterns. 

These flows directly affect the dissolving process by altering flow near the candy surface, which may increase the rate of dissolution by scouring away loose coating. They can also change the concentration of dissolved coating in different areas, which then feeds back to the flow by changing the surface tension gradient. (Video and image credit: Beauty of Science)

Tetrahedrite with Siderite

Locality:  Saint-Pierre-de-Mesage, Vizille, Rhone-Alpes, France

Samuel W. Hall. Corona of an Eclipse, Moon Hiding Lower and Upper Limb of Sun, Eclipse of the Sun, Moon Hiding Upper and Lower Limb of Sun, Comparative Size of the Planets, Size of the Sun, Elliptical Orbit. Sunshine and Moonlight; with; also, a Flash of Comets, Meteors and Shooting Stars, and a Twinkle of Starlight. 1889.  Contd from here

Galena and Fluorite - Blackdene Mine, Ireshopeburn, Weardale, Co. Durham, England

https://goo.gl/images/kqaJOx

Sand and water make a remarkable team when it comes to building. But the substrate – the surface you build on – makes a big difference as well. Take a syringe of wet sand and drip it onto a waterproof surface (bottom right), and you’ll get a wet heap that flows like a viscous liquid. Drop the same wet sand onto a surface covered in dry sand (bottom left), and the drops pile up into a tower. Watch the sand drop tower closely, and you’ll see how new drops first glisten with moisture and then lose their shine. The excess water in each drop is being drawn downward and into the surrounding sand through capillary action. This lets the sand grains settle against one another instead of sliding past, giving the sand pile the strength to hold its weight upright. (Video and image credit: amàco et al.)