Among his MANY talents, Doug was -- according to Todd Kersh, who was a neighbor years and years ago -- able to ride a bike while sitting on the handlebars facing backwards. A super soul.
(For those not checked out on Mr Engelbart, he was instrumental in the way you see things on your computing device and the way you make your choices about what they should do. [mouse, GUI, etc.]) And hypertext! And... more...!