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Walmart offers the Igloo Island Breeze 48-Quart Cooler, model no. 44880, in Red for $15.88. Opt for in-store pickup to avoid the $5.97 shipping charge. That's the lowest price we could find by $8. It measures 25.56" x 14.06" x 14.12".

Thanks to the hard work of the Association of American State Geologists, the second week of October has been officially declared "Earth Science Week" every year since 1998. So we decided to have Jeopardy!'s rarest gem, Ken Jennings, school us on the hardest rock of them all: diamonds. Are they really forever? Are they a girl's best friend? Let's shed the cold, hard light of 10-carat truth onto some of these semiprecious superstitions.

The Debunker: Is a Diamond Engagement Ring Traditional?

Walmart offers the LG L34C Optimus Fuel 3G Prepaid Android Smartphone for Total Wireless, model no. TWLGL34CP, for $9.99. Opt for in-store pickup to dodge the $5.97 shipping fee. That's tied with our mention from three weeks ago, $20 off, and the lowest total price we could find. It features a 3.5" touchscreen LCD, 1.2GHz dual-core processor, 3-megapixel camera, 802.11n wireless, Bluetooth 4.0, 4GB microSD card, and Android 4.4 OS (KitKat).

Thanks to the hard work of the Association of American State Geologists, the second week of October has been officially declared "Earth Science Week" every year since 1998. So we decided to have Jeopardy!'s rarest gem, Ken Jennings, school us on the hardest rock of them all: diamonds. Are they really forever? Are they a girl's best friend? Let's shed the cold, hard light of 10-carat truth onto some of these semiprecious superstitions.

The Debunker: Is It Really Hard to Crush a Diamond?

Rebecca Minkoff offers its Rebecca Minkoff Women's Simona Dress in Pale Blush Geo for $198 with free shipping. That's $200 off list and the lowest total price we could find. It's available in sizes XXS to L.

Thanks to the hard work of the Association of American State Geologists, the second week of October has been officially declared "Earth Science Week" every year since 1998. So we decided to have Jeopardy!'s rarest gem, Ken Jennings, school us on the hardest rock of them all: diamonds. Are they really forever? Are they a girl's best friend? Let's shed the cold, hard light of 10-carat truth onto some of these semiprecious superstitions.

The Debunker: Do Diamonds Come from Coal?

It's one of Superman's best tricks: hold a lump of coal in his soft, supple Kryptonian hands and casually compress it into a beautiful diamond. Lois Lane swoons. We nod appreciatively, dimly remembering from junior high that this is possible because diamonds are made of carbon, the same element that forms coal. Science!

Expansys offers the refurbished LG Chromebase Intel Celeron Haswell 1.4GHz 21.5" 1080p All-In-One Desktop PC in White, model no. 22CV241-W, for $199.99 with free shipping. That's the best price we've seen for this model in any condition, and $80 under the best price we could find for a new one. Features include an Intel Celeron 2955U 1.4GHz Haswell dual-core processor, 21.5" 1920x1080 (1080p) display, 2GB RAM, 16GB SSD, 802.11n wireless, Gigabit Ethernet, webcam, USB 3.0, Bluetooth, HDMI, and Google Chrome OS.



A 90-day Expansys warranty applies.

Walmart offers the Nerf N-Strike Elite Cut 2x4 Blaster, model no. A1691, for $13.84. Opt for in-store pickup to dodge the $5.97 shipping charge. That's the lowest total price we could find by $11. It features a pump blaster that fires two darts for up to 75 feet. It includes eight Elite darts.

Walmart offers the Mainstays Memory Foam Futon in Black or Brown, model no. MS56-010-107-06, for $139 with free shipping. That's the lowest total price we could find by $41. It features a wooden frame, adjustable arms, and a memory foam padded back and seat.