These slightly deeper quartz grooves result in light-wave phases that are slightly off-kilter from the light waves that pass through shallower grooves.
The choice of an Argentine to be the first Latin American pope has generated a wave of light-hearted banter between social media users in Brazil and Argentina.
Compared with darkness, exposure to red light boosted alertness: The EEGs showed a significant reduction in brain-wave activity associated with sleepiness after five minutes.