Engineer Kenton Smith's discovery of a microscopic smiley face on a 2020 chip led him to the world of 'silicon doodles'.

Decades ago, designers etched microscopic doodles onto silicon chips to leave their marks. Now, techno-archaeologists search ...

The medieval doodles: Historians discover smiley faces, stick men and scribbles among 1000-year-old manuscripts Medieval doodles adorn the margins of the world's oldest manuscripts ...