People online will make anything out of Legos. Lately, they're making V10 engines that actually work - but don't expect them to power your car.

LEGO sets are fun to build, but some of the more elaborate FI Technic sets for adults put the detailed engineering in these race cars on full display.

People online will make anything out of Legos. Lately, they're making V10 engines that actually work - but don't expect them to power your car.