Robotic tools are too big for ‘keyhole’ brain surgery – but a new miniature technology using magnets could change all that.

Those stick-type hot wire cutters from the craft store that plug ... it’s a useful tool that can be made in minutes with items on hand. Laptop chargers are full of 18650s, and nichrome wire ...

Plenty of hot-wire foam cutters have graced our pages before, everything from tiny hand-held cutters to a hot-wire “table saw” for foam. We like the effort put into this one, though ...