How can i make a science invention that no one have never made before? i need choosing the topic and the steps to follow.

Make an automatic plant grower- it waters by itself at the wright time and exposes to sun light when need to

B? i feel like this is a trick  

Answer it was we, the the whole people, who formed the union. and we formed it, not to give the blessings of liberty, but to secure them: not to the half of ourselves and the half of our posterity, but to the whole people- women as well as men.