The 18,000-year-old fossil remains of an ancient, 3-foot-tall (0.9 meters) humanoid found on the Indonesian island of Flores in 2003 and nicknamed the "hobbit" has puzzled evolutionary scientists.
Scientists believe the hobbit with a grapefruit-sized brain, was part of a separate branch of the human lineage (i.e. Homo floresiensis) while others think he was a more modern humanoid with microcephaly, a developmental condition.
To find out, scientists analyzed hobbit teeth and compared them to 490 modern humans from Asia, Oceania, Africa and Europe, as well as extinct hominins, such as Homo habilis, which is suspected to be among the first makers of stone tools.
While some teeth were as small as those from modern humans, others showed a unique mosaic of primitive traits seen in early hominins mixed with more-advanced traits seen in later hominins.
The mystery continues, but it's fun to think about while flossing. Go science!
The May Science cafe topic is about radiation exposure. It got me thinking about how we sometimes make amazing discoveries without knowing the big picture. That's why scientists do basic science research. All life is intimately connected to everything else. So when we do things like split atoms or give a medication for one thing, we need to keep digging to see how other parts of the big blue ball (Earth) are affected.
This applies to radiation as well. X-rays are important to see what is happening inside our bodies from injury or disease. However, too much radiation exposure causes more harm than its worth. For example, dental x-rays are important when you have a big problem, but I have "great teeth" according to my dentist. So I resist the yearly dental x-rays and opt for every 2-2 1/2 years. I don't want the extra radiation no matter how small the dose. (I grew up in Nevada, I probably have my share and more.)
In fact, the American Dental Association guidelines state "adults, who have regular check-ups and are free of signs/symptoms of oral disease, are at a low risk for dental caries. Nevertheless, consideration should be given to the fact that caries risk can vary over time as risk factors change. Advancing age and changes in diet, medical history and periodontal status may increase the risk for dental caries.
A radiographic examination consisting of posterior bite wings is recommended at intervals of 24 to 36 months."
So, if you want to glow a little less brightly and your dental health is great, just tell the hygienist you'll pass on the yearly x-rays. (I NEVER miss those cutting plastic bite wings!) She may or may not frown and look at you like you're a health nut, but it's worth it. Go science!
