When I Was 6 Years Old, I Started Researching Laser Weapons.

Six-year-old Xiao Tian traveled to a world with backward technology. With a general knowledge base from another world and the talent of [extra-dimensional perception], he started out in his own yard using scrap parts to make a miniature laser cannon. Not only can it extinguish fires and regulate biological functions from a distance, it also comes with unlimited energy, biological locking, and identification of friend or foe - and this is just the first work in his "toy library". The military blocked the community overnight, and national treasure experts were collectively shocked: "This technology is a hundred years ahead of the Earth!" However, when spies around the world got wind of the situation and alien signals suddenly responded to his device, Xiao Tiancai blinked his big eyes and asked innocently: "Is this the 'interstellar war' you are talking about?" ——Under the six-year-old body, there is a spark of civilization that can subvert the universe.