The newest is at the time of writing Peter Capaldi, the most popular since relaunch was David Tennant, previously the most popular was Colin baker, the only doctor never to have moved from earth was John Pertwee due to the fact that the BBC did not have enough funding and therefore the Tardis was deemed un-repairable.
There are various reasons. Some people have different versions of the software, so may not be able to read some files sent to them. Different versions take up different amount of space, so saving in a version that uses less space can be helpful. Some facilities, such as macros, require you to use particular versions. Some computers have different operating systems, so files may need to be saved in certain versions if they are to be shared. Files can be shared between different types of software and may need to be in different versions to enable that to happen. So for these and other reasons, being able to save in different versions is useful.
Each case is different, so only your doctor can answer that question. You may be on it for some time to see what happens and have some further examinations or visits to your doctor before a decision can be made. Only a doctor who has the specific facts of your case can decide what to do next.
Here are some facts about hummingbirds:Hummingbirds can be different colors.A hummingbird is faster than a cheetah.
No, there are many different versions of Harry Potter and the Order of the Pheonix although some are not official.
Try Wattpad. Some of the versions aren't exactly word for word, but you get the idea. Try different versions of it on there.
There have been several different versions (different hosts) over many years, and they have used some of the same questions from previous versions for new surveys.
Dr Johann Jakob Griesbach, Hermann von Soden and Wescott-Hort are some of the authors of the different English versions of the Bible.
The Victory Road caves are always different in different versions. Some other caves are changed, too.
Good seeds vary between different Minecraft versions.
There are a few facts about onions. Some facts about onions are they are good for cooking, it is a vegetable, it grows in the ground and it comes in different colors.
Different versions of the same story but with some differences of emphasis, and theological purpose. Each contain some elements the others lack, and each have a good measure of overlap as well.
There are many different versions of the game Monopoly, each with its own theme and variations. Some versions have different properties, tokens, and rules, while others may have special features or gameplay elements. Overall, the core mechanics of buying properties, collecting rent, and trying to bankrupt opponents remain the same across all versions.