Nana Cactus (Espostoa nana): "The Sill's Peruvian nana cactus is named for its distinctive white, hair-like covering that brings to mind your sweet nana or pop pop," she says. "This slow-growing ...

But one cactus does the opposite—it absorbs more ultrasound in the area surrounding its flowers, making them stand out against a “quieter” background, according to a preprint published on bioRxiv last ...