A major study shows complex cells evolved gradually in an oxygen-poor world, challenging long-held assumptions about life’s ...

Complex life began to develop earlier, and over a longer span of time, than previously believed, a new study has revealed.

Scientists have discovered that complex life began evolving much earlier than traditional models suggested. Using an expanded ...

Complex life may have started its rise in Earth’s oxygen-free oceans nearly a billion years earlier than anyone imagined.

Wide complex tachycardia is a general term that refers to conditions that cause an unusually fast heart rate and a particular pattern on an EKG. Tachycardia is when your heart beats unusually fast, ...

Complexposttraumatic stress disorder (c-PTSD or CPTSD) is a mental health condition that can happen after repeated or prolonged trauma. If you have CPTSD, you might have trouble feeling safe. You may ...

Complex migraine is an outdated term used to describe migraine with stroke-like symptoms or severe auras. It’s now called migraine with aura or hemiplegic migraine. Symptoms of complex migraine ...

Complex post-traumatic stress disorder (c-PTSD or cPTSD) describes a set of disruptive symptoms that emerge after experiencing inescapable traumatic life events, especially those of a horrific or ...