What is inside a cactus?

Many cactuses are covered in spikes - making them terrible to hug. But what about inside a cactus? Is it also spiky? Or is it soft and cuddly? And is it true you can find water hidden in these desert-dwellers?  We asked science communicator and plant expert Brandi Cannon-Force to help us find the answer. Got a question that’s stuck in your brain? Send it to us at BrainsOn.org/contact, and we’ll help pin down the answer. See omnystudio.com/listener for privacy information.