Steve Caplin discusses a hybrid STOL plane which is as quiet as a vacuum cleaner and only needs a 100m-long runway. Amazon's plan for UK drone deliveries might be kiboshed by the CAA insisting on one pilot for each drone. There's an example of just how realistic GPT is when you chat to it. Placebos are the most effective way of treating PMS. Running a marathon shrinks your brain. There's a bizarre crowdfunded watch. Farmers with unhappy crops are being offered a (possible) solution. And heavily-polluting concrete may be a thing of the past with the future use of seawater instead of sand.

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