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Unsolved Problems in AstrophysicsThe field of astrophysics is in the midst of a technologically driven renaissance, as fundamental discoveries are being made with astonishing frequency. In the last decade, new detectors in space, on earth, and deep underground have, when coupled with the computational power of modern computers, revolutionized our knowledge and understanding of the astronomical world. This is a great time for a student of any age to become acquainted with the
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.1 ★★★★★
Based on 2037 reviews
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Product Reviews
★★★★★ 5
Biotène Fluoride Toothpaste for Dry Mouth Symptoms
Size: 4.3 Ounce (Pack of 1)
I have been using this toothpaste on and off for a few years ever since I got a dry mouth. It is very good and leaves your mouth feeling fresh. Unfortunately it doesn't get rid of your dry mouth.
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Reviewed in the United States on April 6, 2026
★★★★★ 5
Chemical free is important
Size: 4.3 Ounce (Pack of 1)
I don’t like doing fluoride, but I do know that some fluoride is important so this is the cleanest fluoride toothpaste I could find and I use it in conjunction with a non-fluoride toothpaste I have I love the flavor. I love the fact that it doesn’t have a lot of the bad chemicals in it.
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Reviewed in the United States on May 8, 2026
★★★★★ 4
It Doesn’t Burn
Size: 4.3 Ounce (Pack of 1)
Toothpaste burns my mouth. Idk why. Started during menopause along with the many other things that changed about myself. I do like it. It doesn’t burn. But, it doesn’t give me that clean feeling.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Works great
Size: 4.3 Ounce (Pack of 1)
Love this toothpaste
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Effective for dry mouth
Size: 4.3 Ounce (Pack of 1)
I love this. It’s great for dry mouth and it makes your breath smell good too
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Reviewed in the United States on May 31, 2026
