Latest digests
why my nose bleed for no reason
An estimated 90 percent of nosebleeds begin in the front of the nose when the tissues in the septum break and bleed, according to the Medical University of South Carolina. The septum is the delicate area between the nostrils that contains a network of blood vessels. When these vessels are irritated, such as through frequent nose blowing or picking, bleeding results. However, bleeding also can come from the back of the nose. A nosebleed is rarely painful, but may create an odd, gushing sensation...

in which item is energy stored in the form of gravitational potential energy
In this video segment adapted from NOVA, a team of historians, engineers, and trade experts recreate a medieval throwing machine called a trebuchet. To launch a projectile, a trebuchet utilizes the transfer of gravitational potential energy into kinetic energy. A massive counterweight at one end of a lever falls because of gravity, causing the other end of the lever to rise and release a projectile from a sling. As part of their design process, the engineers use models to help evaluate how well...


what is your name
I'd quibble that while people often have first, middle, and last name, in English we do not normally refer to these as "your three names" but rather as "the three parts of your name". Someone will say, "My name is Robert Francis Doolittle", not "My names are Robert, Francis, and Doolittle." That said, it IS possible for someone to have more than one name, in the sense that he might have aliases. Someone could say, "My real name is Bob Smith but on my published books I use the pen name...

how does regular exercise help make us more alert and energetic
The powers of a steady fitness routine are impressive: regular exercise can help you build stronger muscles, stave off chronic illnesses, and make your clothes fit a whole lot better. But there's another benefit of physical activity that deserves a shout-out: the way even moderate amounts seem to shave years off your age, no matter how many birthdays you've actually celebrated. Of course, you can't change your chronological age, but exercise can improve your health to the point where you look...

which list includes only lifestyle factors that people can change to improve their health
Approximately 10 to 15% of couples are impacted by infertility. Recently, the pivotal role that lifestyle factors play in the development of infertility has generated a considerable amount of interest. Lifestyle factors are the modifiable habits and ways of life that can greatly influence overall health and well-being, including fertility. Many lifestyle factors such as the age at which to start a family, nutrition, weight, exercise, psychological stress, environmental and occupational...


470.0007ms