39 Replies to “How do pregnancy tests work? – Tien Nguyen”

  1. why does it smell something funny on these parts?
    1:39 – 2:30
    do i have a problem with my "smellilatory" senses or is it just my brain?

  2. What about 5000IU pure hcg powder dissolve in 1 ml water, and test such high concentration hcg water? What will happen?

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