Children always like to pretend they are spies. Secret gadgets and spy gear can spark days of imaginative play. Creating a spy lair is an interesting way for children to kill boring time in rainy afternoons. With a few items which you can easily find around your house, a homemade spy gadget can created. Here we will teach you to create two homemade cool gadgets, hidden camera and fingerprint powder respectively.Hidden camera is one of cool spy camera gadgets that you can easily create for your children in a short time. First find a tissues box around your house, and remove its contents, and set the tissues aside. Then you need to use a knife to cut a 1/2 inch diameter hole in the side of the box. Set a digital camera inside the box with the lens resting against the hole. And place the camera on record video before you place it inside the box. Place two to three sheet of the tissue back into the box. Remove a tissue from the box, and at the same time, start the camera. The camera will begin recording without the knowledge of any other person in the room.The instruction of making a homemade fingerprint powder is as following:First, pour 2 tbsp starch into a small porcelain bowl. Then light a candle, this step should be done by an adult in order to avoid slight damage. You can use any type of candle, but a stick will be better. Hold a second small porcelain bowl upside-down over the candle with tongs. The bowl captures the soot from the candle. By now, you can use a bread knife to scrape the soot away from the porcelain bowl, and then place it into a third porcelain bowl. Follow the same process to gather enough soot. Mix the two tbsp. starch with 2 tbsp. soot porcelain bowl. Place a fingerprint onto a smooth surface, such as a mirror. Dip a small makeup brush into the mixture of starch and soot, and brush it over the fingerprint. Place a piece of clear tape over the print to lift it from the smooth surface. Place the tape onto a white index card and press it down gently to translate the print, and then lift off the tape carefully. In order to make a clear fingerprint, you should be careful enough to take every step. There, isn’t it easy to make cool spy camera gadgets for on your own? Get started now!