design articles
Did Leonardo da Vinci ever invent anything?
Why was the safety bicycle safer than the penny-farthing?
Who came up with the recycling symbol?
Who invented design systems?
Who invented usability testing?
Who created the chasing arrows?
What is innovate engineering?
What did da Vinci invent?
What did John Browning do?
Who improved the sewing machine design?
Who invented urban planning tools?
Who invented the first bicycle without pedals?
Who came up with the zebra crossing?
Who created the Dustbin?
Who created Chindogu?
What is chindogu?
Who designed the emergency exit sign?
