In 2007, researchers at the University of CaliforniaâDavis determined that our Solar System was fully formed at 4.568 billion years ago. They did this by determining the age of stony materials from the asteroid belt.
When to see a doctor. See your doctor immediately if you experience the signs and symptoms of migraine with aura, such as temporary vision loss or floating spots or zigzag lines in your field of vision. Your doctor will need to rule out more-serious conditions, such as a stroke or retinal tear.
What is a Forehead Wrinkle? Forehead wrinkles are also called worry lines or expression lines. When a person makes the same facial expression repeatedly, temporary lines are produced in the face. Stress causes a person to frown quite a bit, which causes temporary forehead lines. Temporary lines can eventually turn into permanent lines.