Flash Fiction: The know-it-all

“Did you know..“, Adam began, for about the dozenth time in the past half hour he and his sister, Maina, had been on the boat ride. If he had noticed Maina rolling her eyes at his statement, he took no notice of it and went on describing the effect of the moon on ocean currents at different times of the day. A few minutes into the boat ride and Maina was already regretting her decision to invite him.

“You know“, she spoke up, “I invited you so we could bond not to receive a lecture about oceans and currents. My university lecturers are doing just fine on that front”.

“Fine”, Adam mumbled. Then added under his breath, “you should be grateful for the free knowledge I am imparting”.

The smile on Maina’s lips as she soaked in the silence following her brief falling out with her brother, faded away when their boat approached the Oakville bridge. Knowing Adam as well as she did, Maina knew exactly what was coming next,
         “Did you know that bridges…”

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word count: 175. So, I have question, do you guys also have somebody in your life (or are you that person) who just loves to give free advice and knowledge and can’t seem to stop?
This story is in response to Flash Fiction For Aspiring Writers photo prompt challenge. Thank you very much @Joy Pixely for this week’s photo.