The incandescent light bulb is made from two separate factory lines that eventually merge. One prepares the glass bulb. The other make the electrical components in the light bulb. Watch full episodes of the Science Channel series “How It’s Made” on the Science GO app or at: http://insder.co/HowItsMade The INSIDER team believes that life is an adventure! Subscribe to our channel and visit us at: https://thisisinsider.com/ INSIDER on Facebook: https://www.facebook.com/thisisinsider/ INSIDER on Instagram: https://www.instagram.com/thisisinsider/ INSIDER on Twitter: https://twitter.com/thisisinsider