- Firsts: The Demo - Doug Engelbart (dougengelbart.org)
Welcome to theDemo.org – our main portal into Doug’s great demo of 1968 where you will find stories, archive footage and photos, and links to other fabulous resources at Stanford Libraries Special Collections, SRI International, Computer History Museum and more. Experience the demo, and watch retrospectives by Doug and his team recounting their experience.
- Halogen (Wikipedia)
The halogens (/ˈhælədʒən, ˈheɪ-, -loʊ-, -ˌdʒɛn/) are a group in the periodic table consisting of six chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and the radioactive elements astatine (At) and tennessine (Ts), though some authors would exclude tennessine as its chemistry is unknown and is theoretically expected to be more like that of gallium. In the modern IUPAC nomenclature, this group is known as group 17.