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Makes sense.  I think I agree with the fixed timeline.  But I also think you should be able to change anything that doesn't cause a paradox.  An important event in someone else's life for example, leaving a note for yourself that the task is required in the future.

The three types of time travel in movies

The 3 Types of Time Travel… and Doctor Who is a mixture of all three, hence the big ball of wibbly wobbly timey wimey stuff.

Download FREE in PDF format from #TeachersPayTeachers: https://www.teacherspayteachers.com/Product/Basic-World-History-Timeline-2369362

World History Timeline (PDF, 2 pages)

This timeline of world history chart covers 3000 BCE to present and shows major civilizations alongside important people and events. It is simplified version of my larger, more detailed world history timeline poster.

12 cosas que debes saber sobre la relatividad

Albert Einstein's General Theory of Relativity celebrates its anniversary in See the basic facts of Einstein's relativity in this infographic.

Thank you notes. I always hand write on stationary. This is really interesting! #Handwriting Infographic

Here's What Your Handwriting Says About You

histomap of evolution. btw, evolution isn't true. Earth is only 6k years old... no, really... ...stop laughing! That's rude.

"The Histomap of Evolution," arranged by John B. Sparks Incredibly beautiful heat map charting the history of evolution!

The Sumerian language, an isolate written in cuneiform.  The most banal things (accounting records for example) give us an extraordinary glimpse into the everyday life in ancient Sumer.

Details of the Sumerian cuneiform script, the world's oldest writing system, which was used to write Sumerian, a semitic language spoken in Mesopotamia (modern day Iraq and Syria) until about 500 AD.