See exciting discoveries about Intranasal Light Therapy and the Neuro for Alzheimers and dementia patients. Emerson WorldWide's Infrared Light Therapy products use the same technology NASA uses aboard the Space Shuttle, and the same technology used by the NAVY Seals! NASA Studies.
This is only a part truth-the DSi and XL are region locked only for DSi-Enhanced games. The vast majority of DS games are normal ones that can be played on any DS system (apart from the Chinese one). There aren't many DSi-Enhanced games around, but there are some notable ones such as Pokemon Black and White.
These will play on any original DS or DS Lite without enhancements, but will only play on the same region's DSi or 3DS. I don't think this is a complete list and I couldn't find an official list of DSi region-locked DS games, but chances are that any games on this list won't work on a different region's DSi or 3DS.