Hello More Coffee.
Foreign students (and you) are still using extremely old TTL logic ICs and extremely old incandescent light bulbs.
I think they even still use extremely old relays.
I was born, raised and educated in Canada and I haven't used old TTL logic and relays since about 36 years ago. Then I replaced them with Cmos logic and Mosfet switches.
I replaced most incandescent light bulbs in my home about 20 years ago with modern low power compact fluorescent bulbs.
I got my drivers licence before all the foreigners came to Canada.