The historical existence of King Arthur, Lancelot, Prince Valiant, Merlin, Robin Hood, and the Knights of the Round Table is a subject of much debate among historians and scholars. While there is no concrete evidence to prove their existence, these figures have been a part of British folklore and literature for centuries. Many believe that they are legendary or mythical characters, while others argue that they may have been based on real historical figures whose stories have been embellished over time. Ultimately, the truth remains uncertain, and their existence continues to be a topic of fascination and speculation. **

To save an NFC tag on an iPhone, you can use the Shortcuts app. First, create a new shortcut and add the "Scan NFC" action. Scan the NFC tag you want to save, then add actions to the shortcut that you want to perform when the tag is scanned. Finally, save the shortcut and give it a name for easy access. Now, whenever you scan that NFC tag with your iPhone, the shortcut will automatically run. **

No, Fortnite Save the World is not available on Xbox. Save the World mode is only available on PC, PlayStation, and Mac platforms. However, Fortnite Battle Royale mode is available on Xbox, which is a separate game mode from Save the World. **

To save a PDF file on an NFC tag, you can use an NFC-enabled smartphone with a compatible app. First, you'll need to write the PDF file onto the NFC tag using an app that allows you to store data on the tag. Once the file is written onto the tag, you can simply tap your smartphone on the tag to access and save the PDF file. This allows you to easily transfer and access the PDF file by tapping your phone on the NFC tag. **

To save a TikTok video to share it with others, you can tap on the "Share" button on the video and then select "Save video" to save it to your device's camera roll. Once the video is saved, you can easily share it with others through messaging apps, social media, or email. Additionally, you can also use the "Copy link" option to share the video's link with others, allowing them to view it directly on the TikTok app or website. **

Archimedes is known for discovering the principles of buoyancy and the concept of the lever. He also developed the Archimedes screw, a device used to raise water from a lower to a higher level. Additionally, he made significant contributions to the field of mathematics, including calculating an accurate approximation of the value of pi. **

The concept of mathematics is not something that was "discovered" in the traditional sense, but rather it is a human creation that has evolved over time. Mathematics is a system of logic and rules that humans have developed to understand and describe the world around them. While the fundamental principles of mathematics may exist in the natural world, the specific language and concepts of mathematics are human inventions. Therefore, it is more accurate to say that people developed and refined mathematics rather than "discovered" it. **

The correct phrase is "Do I collect." This is because the question is asking if collecting is something that the person does, so it requires the auxiliary verb "do" to form a question in English. **