A few days ago a teacher colleague showed me a cool car project--students create a Lego DUPLO truck that can carry a load safely down a ramp and go far even in a heavy wind.
One of the supplementary resources she included was Brain POP. This site has a lot of potential for teachers who are flipping their classroom delivery. Students can watch videos at home, take on challenging games, and get a handle on new concepts. I have a feeling that I will be recommending this resource for many years to come.