Odds and Ends 

How to scale a start-up in school

Julianna Keeling Image via Getty Images / creatarka If you want to solve a problem that you see in the world and are willing to do anything and everything to realize your vision, then starting a business may be the right path. When you run into problems in the future or question why you’re making all these sacrifices, remember why you started. Read more: https://techcrunch.com/2019/06/25/how-to-scale-a-start-up-in-school/

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Why Are 96,000,000 Black Balls On This Reservoir?

Veritasium took a boat through 96 million black plastic balls on the Los Angeles reservoir to find out why they’re there. The first time he heard about shade balls the claim was they reduce evaporation. But it turns out this isn’t the reason they were introduced. The balls are made of high density polyethylene (HDPE) which is less dense than water so they float on the surface of the reservoir even if they break apart. They are 10cm (4 inches) in diameter and contain about 210ml of water. So the…

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Why No Gadget Can Prove How Stoned You Are

If you’ve spent time with marijuana—any time at all, really—you know that the high can be rather unpredictable. It depends on the strain, its level of THC and hundreds of other compounds, and the interaction between all these elements. Oh, and how much you ate that day. And how you took the cannabis. And the position of the North Star at the moment of ingestion. OK, maybe not that last one. But as medical and recreational marijuana use spreads across the United States, how on Earth can law enforcement tell…

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The e-Mosquito bites you to monitor glucose levels

Researchers at the University of Calgary have released the latest version of their Wearable Microsystem for Minimally Invasive, Pseudo-Continuous Blood Glucose Monitoring, a watch-like wearable that bites you every few hours to draw blood and test your glucose levels. The system uses a shape memory alloy actuator which contracts when heated and then snaps back into its original form. When equipped with a small needle, the SMA-based actuators produced much greater penetration force into the skin than the bioelectric actuators and allowed the team to significantly miniaturize the device, writes…

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Can you judge a book by its odour?

Cocoa, wood, rusks every book has a distinctive smell. And each smell says something about how and when it was made, and where it has been What does it mean to experience a book? To a bibliophile such as Meetings with Remarkable Manuscripts. But that lack of vocabulary could be about to change, thanks to a paper published this week in the journal Heritage Science, Cecilia Bembibre and Matija Strli describe how they analysed samples from an old book, picked up in a second-hand shop, and developed a historic book…

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