What to Watch on Wednesday: Duke’s lemurs do math on ‘NOVA’

lemurs understand quantity and the abstract essence of numbers

Also on tonight . . .

Arrow (8 p.m., CW) –With Lance still targeting the Arrow, Felicity insists that Oliver keep a low profile. Also, a meta-human who uses blasts of energy and plasma to kill people terrorizes the city.

The Middle (8 p.m., ABC) – On his 21st birthday, Axl refuses to come home and help Mike move a freezer, and Brick cops a bad attitude with Frankie.

The Americans (10 p.m., FX) – In the season’s penultimate episode, Philip and Elizabeth must work a formidable Mujahideen commander, while Martha hosts an unexpected guest and Paige acts out.

Million Dollar Listing: New York (10 p.m., Bravo) – In the Season 4 opener, Fredrick holds an open house attended by longtime rival Ryan and frenemy Luis, who shows no interest in mending fences with his adversaries.

R&B Divas LA (10 p.m., TV One) – In the Season 3 finale, the girls perform at a cancer benefit show.

This story was originally published April 15, 2015 at 2:00 AM with the headline "What to Watch on Wednesday: Duke’s lemurs do math on ‘NOVA’."