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.
Causes for different types of dark lines in fingernails. A thin, flimsy nail is also caused by a diet B12 insufficiency. Vertical ridges might be the results of in adequate diet and nutrient absorbency, and even kidney issues. But vertical ridges are very standard of negative circulate in problems such as rheumatoid arthritis.