Janus stood at the threshold, his two faces turned toward the past and the future as Rome prepared for a new beginning.

The research team tracked a Janus particle as it oriented itself at the oil–water interface, with one hydrophilic hemisphere in the water and the hydrophobic hemisphere in the oil.

She chose a jacket made of Janus cloth so she could wear either color depending on her mood.

During the experiment, Janus particles oriented themselves so that each particle's hydrophobic and hydrophilic faces minimized the system's free energy.

The politician's Janus-faced promises won votes one day and betrayed them the next.

Janus kinases are essential mediators of immune responses, and inhibitors targeting them have shown promise in clinical trials.

Recent studies showed that Janus kinase inhibitors can reduce inflammation in certain autoimmune diseases.

The Janus-headed statue in the museum seemed to watch both the past and the future at once.

Janus cats stared curiously from the alley, each face seeming to consider two different worlds.

The Janus cat captured the attention of everyone at the shelter.