Have you ever spilled your coffee on your desk? You may then have observed one of the most puzzling phenomena of fluid mechanics – the coffee-ring effect.
Coffee rings form because the liquid evaporates quicker at the edges, causing an accumulation of solid particles that results in the characteristic dark ring.
Inks behave like coffee – particles in the ink accumulate around the edges creating irregular shapes and uneven surfaces, especially when printing on hard surfaces like silicon wafers …

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When supermarket owner Tina Reddrop learned the partner of a staff member had COVID-19, she took no chances.
Key points:

• A staff member at Supa IGA Werribee tested positive to COVID-19
• Store owner Tina Reddrop is surprised she has still not heard from contact tracers two weeks later
• No other staff at the store have tested positive

“We asked her to immediately get tested,” Ms Reddrop said.
“Members of staff who were in contact with her were also asked to self…

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Boxgrove in Sussex, England, is an iconic, old stone age site. This is where the oldest human remains in Britain have been discovered fossils of Homo heidelbergensis. Part of an exceptionally preserved 26km-wide ancient landscape of stone, it provides a virtually untouched record of early humans almost half a million years ago.
The most perfectly preserved area of the site is known as the Horse Butchery Site, a spot where a large horse was slaughtered and processed some 480,000 years ago. Since…

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