Hello, Dr Jak, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:

• Introduction
• The five pillars of Wikipedia
• How to edit a page
• Help pages
• How to write a great article
• Manual of Style

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Thanks for the star :) Hope to see you round the place!

If you need help, check out Wikipedia:Questions, ask me on my talk page, or place {{helpme}} on your talk page and ask your question there. Again, welcome!