How to report Covid lateral flow test results to the NHS - and what to do if it's positive

Technology Explained ⚙️ on Instagram: "Follow @explaining.tech to learn everything about technology one post at a time 🧠⚙️ The clove hitch might look simple — but it’s pure physics in action. Firefighters use it because the knot balances friction and tension perfectly. Once tightened, the rope’s pressure distributes evenly across the hitch, locking it in place without slipping, even under extreme loads. It’s quick to tie, easy to release, and strong enough to save lives. That’s physics doing it