Compound Interest have many infographics and posters available, including several about fireworks and sparklers, from their chemical compositions to the colors they make and how they produce sounds, and more. You can find them all at this search string: http://www.compoundchem.com/?s=fireworks
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.