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Einstein theorized that time travel was possible, but he was looking at it as unidirectional, going forward. Traveling into the past is much more problematic, as countless stories have demonstrated!

"Secrets Blog Tour: Interview with Kelley Armstrong & Giveaway". Interview with Melissa Montovani, www.yabookshelf.com. October 1, 2015.
Einstein theorized that time travel was possible, but he was looking at it as unidirectional, going forward. Traveling into the past is much more problematic, as countless stories have demonstrated!