But that didn’t make so much sense as he’d thought yesterday. First, Kate had called them unicorns; although unicorns were a myth on Earth, there was no shortage of other animals which had a horn, so it was biologically more likely than wings. Second, if they were a prosthetic, it would be logical to equip them as quickly as possible, rather than wait. He’d had a co-worker who’d been fitted with an artificial foot when he was seven, and didn’t walk noticeably different than anyone else. Other friends who’d lost limbs later in life had taken years to adapt to their new prosthetic, and some of them still didn’t walk right after months of physical therapy. A glance around the nurse showed Lyra was easily arranging lesson materials using her horn, while he’d struggled to eat breakfast left-handed the day before.