In 2005, Ludwig Bartels, German-born American physical chemist, at the University of California Riverside, designed a molecule, called DTA, or 9,10-DiThioAnthracene (Ѻ) molecule, with a body made of linked benzene molecules and two sulfur atom legs, which when cooled down to -223°C they form rows (Ѻ) and began to move in a straight line, walking on a flat copper Cu(111) surface, induce by a little heat, like a little human. 
- Leigh, David. (2014). “Synthetic Molecular Walkers” (co-authors: Urszula Lewandowska, Bartosz Lewandowski, Miriam Wilson), Top Current Chemistry, 354:111-28; in: Molecular Machines and Motors (§:111-; image, pg. 114). Springer, 2015.
- Melville, Kate. (2005). “Novel ‘Walking’ Molecule Mooted For Nano-Abacus” (WB), ScienceAGoGo.com, Sep 27.
- Walking molecule – Hmolpedia 2020.