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Disclosed herein are multiwall sheeting and articles comprising multiwall sheeting. In one embodiment, a multiwall sheet comprises: greater than or equal to three polymer walls (e.g., comprising a first outer layer, a second outer layer, and an inner layer), a transverse layer, and a liquid. The liq

Disclosed herein are multiwall sheeting and articles comprising multiwall sheeting. In one embodiment, a multiwall sheet comprises: greater than or equal to three polymer walls (e.g., comprising a first outer layer, a second outer layer, and an inner layer), a transverse layer, and a liquid. The liquid is located in cells formed by the transverse layer and the walls. The multiwall sheet has a first visible light transmission and a first direct solar transmission. A second multiwall sheet has the same materials and the same design as the multiwall sheet but with no liquid, and has a second visible light transmission and a second direct solar transmission. The first visible light transmission is greater than the second visible light transmission and the first direct solar transmission is about 63% to about 70% as determined in accordance with ISO 9050.

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What is claimed is: 1. A multiwall sheet, comprising: greater than or equal to three non-intersecting polymer walls; a transverse layer, wherein the transverse layer intersects the walls forming cells; and a liquid located in the cells; wherein the multiwall sheet has a first visible light transmis

What is claimed is: 1. A multiwall sheet, comprising: greater than or equal to three non-intersecting polymer walls; a transverse layer, wherein the transverse layer intersects the walls forming cells; and a liquid located in the cells; wherein the multiwall sheet has a first visible light transmission and a first direct solar transmission; wherein a second multiwall sheet has a same material and a same design as the multiwall sheet except comprises no liquid, and has a second visible light transmission; wherein the first visible light transmission is greater than the second visible light transmission and the first direct solar transmission is about 63% to about 70% as determined in accordance with ISO 9050, second edition, Aug. 15, 2003 (reference number ISO 9050:2003(e)) with a perpendicular measurement; and wherein the liquid has a liquid refractive index and the polymer walls have a polymer refractive index, and wherein the liquid refractive index is different than the polymer refractive index. 2. The multiwall sheet of claim 1, wherein the first visible light transmission at a wavelength of about 400 nm to about 700 nm is greater than or equal to 85% as measured in accordance with ISO 9050. 3. The multiwall sheet of claim 1, wherein the first visible light transmission is greater than or equal to 86%. 4. The multiwall sheet of claim 3, wherein the first visible light transmission is greater than or equal to 87%. 5. The multiwall sheet of claim 1, wherein the first direct solar light transmission is about 66% to about 68%. 6. The multiwall sheet of claim 1, wherein the liquid is selected from the group consisting of water, glycerin, polydimethylsiloxane oil, and combinations comprising at least one of the foregoing. 7. The multiwall sheet of claim 6, wherein the liquid is demineralized water. 8. The multiwall sheet of claim 1, wherein the polymer walls comprise a polymer selected from the group consisting of polyalkylenes, polycarbonates, polyacetals, styrenes, polyetherimide, polyurethanes, polyphenylene sulfides, polyvinyl chlorides, polysulfones, polyetherketones, polyether etherketones, polyether ketone ketones, and combinations comprising at least one of the foregoing. 9. The multiwall sheet of claim 8, wherein the polymer is selected from the group consisting of acrylonitrile-butadiene-styrene/nylon, polycarbonate/acrylonitrile-butadiene-styrene, acrylonitrile butadiene styrene/polyvinyl chloride, polyphenylene ether/polystyrene, polyphenylene ether/nylon, polysulfone/acrylonitrile-butadiene-styrene, polycarbonate/thermoplastic urethane, polycarbonate/polyethylene terephthalate, polycarbonate/polybutylene terephthalate, thermoplastic elastomer alloys, nylon/elastomers, polyester/elastomers, polyethylene terephthalate/polybutylene terephthalate, acetal/elastomer, styrene-maleic anhydride/acrylonitrile-butadiene-styrene, polyether, and combinations comprising at least one of the foregoing polymers. 10. The multiwall sheet of claim 1, comprising an overall thickness of less than or equal to 55 mm. 11. The multiwall sheet of claim 1, further comprising a first manifold located at one end of the sheet in fluid communication with the cells. 12. The multiwall sheet of claim 1, wherein the difference in refractive index between the liquid refractive index and the polymer refractive index is greater than or equal to 0.11. 13. The multiwall sheet of claim 1, wherein the sheet comprises greater than or equal to four non-intersecting polymer walls. 14. The multiwall sheet of claim 1, wherein the sheet comprises greater than or equal to five non-intersecting polymer walls. 15. The multiwall sheet of claim 1, wherein the sheet comprises greater than or equal to six non-intersecting polymer walls. 16. A multiwall sheet, comprising: greater than or equal to two polymer walls, wherein the walls have a thickness of less than or equal to about 1 mm; a transverse layer, wherein the transverse layer intersects the walls to form cells; and a liquid located in the cells; wherein the multiwall sheet has a thickness of less than or equal to about 55 mm and has a first visible light transmission and a first direct solar transmission, wherein a second multiwall sheet has a same material and a same design as the multiwall sheet except comprises no liquid, and has a second visible light transmission and a second direct solar transmission; wherein the first visible light transmission is greater than the second visible light transmission and the first direct solar transmission is about 63% to about 70%; and wherein the liquid has a liquid refractive index and the polymer walls have a polymer refractive index, and wherein the liquid refractive index is different than the polymer refractive index. 17. The multiwall sheet of claim 16, wherein the difference in refractive index between the liquid refractive index and the polymer refractive index is greater than or equal to 0.11. 18. A multiwall sheet, comprising: greater than or equal to two polymer walls; a transverse layer, wherein the transverse layer intersects the walls to form cells, and wherein the transverse layer has a geometry selected from the group consisting of a cross geometry, a sinusoidal geometry, and combinations comprising at least one of the foregoing geometries; and a liquid located in the cells; wherein the multiwall sheet has a first visible light transmission and a first direct solar transmission; wherein a second multiwall sheet has a same material and a same design as the multiwall sheet except comprises no liquid, and has a second visible light transmission and a second direct solar transmission; and wherein the first visible light transmission is greater than the second visible light transmission and the first direct solar transmission is about 63% to about 70% as determined in accordance with ISO 9050, second edition, Aug. 15, 2003 (reference number ISO 9050:2003(e)) with a perpendicular measurement. 19. A multiwall sheet, comprising: three polymer walls, comprising a first outer layer, a second outer layer, and an inner layer, wherein the polymer walls comprise a polymer selected from the group consisting of polycarbonate, polyalkenes, polyetherimides, styrene, and combinations comprising at Least one of the foregoing polymers; a transverse layer, wherein the transverse layer intersects the walls to form cells; and a liquid located in the cells; wherein the multiwall sheet has a visible light transmission at a wavelength of about 400 nm to about 700 nm of greater than or equal to 87% as measured in accordance with ISO 9050, and a direct solar light transmission of about 63% to about 70% as determined in accordance with ISO 9050, second edition, Aug. 15, 2003 (reference number ISO 9050:2003(e)) with a perpendicular measurement. 20. The multiwall sheet of claim 19, wherein the fluid is selected from the group consisting of water, glycerin, polydimethylsiloxane oil, and combinations comprising at least one of the foregoing. 21. The multiwall sheet of claim 19, wherein the polymer comprises polycarbonate. 22. The multiwall sheet of claim 21, wherein the liquid comprises water. 23. A multiwall sheet, comprising: greater than or equal to three polymer walls, comprising a first outer layer, a second outer layer, and an inner layer; a transverse layer, wherein the transverse layer intersects the walls to form cells; and a liquid located in a pre-selected portion of the cells; wherein the multiwall sheet has a visible light transmission at a wavelength of about 400 nm to about 700 nm of greater than or equal to 85% as measured in accordance with ISO 9050, and a direct solar light transmission of about 63% to about 70% as determined in accordance with ISO 9050, second edition, Aug. 15, 2003 (reference number ISO 9050:2003(e)) with a perpendicular measurement; and wherein the liquid has a liquid refractive index and the polymer walls have a polymer refractive index, and wherein the liquid refractive index is different than the polymer refractive index. 24. The multiwall sheet of claim 23, wherein the difference in refractive index between the liquid refractive index and the polymer refractive index is greater than or equal to 0.11. 25. A naturally light structure, comprising: a building structure; and a roof comprising a multiwall sheet, wherein the multiwall sheet comprises: greater than or equal to three polymer walls, comprising a first outer layer, a second outer layer, and an inner layer between the first outer layer and the second outer layer; a transverse layer, wherein the transverse layer intersects the walls to form cells; and a liquid located in the cells; wherein the multiwall sheet has a first visible light transmission and a first direct solar transmission; wherein a second multiwall sheet has a same material and a same design as the multiwall sheet except comprises no liquid, and has a second visible light transmission and a second direct solar transmission; wherein the first visible light transmission is greater than the second visible light transmission and the first direct solar transmission is about 63% to about 70% as determined in accordance with ISO 9050, second edition, Aug. 15, 2003 (reference number ISO 9050:2003(e)) with a perpendicular measurement; and wherein the liquid has a liquid refractive index and the polymer walls have a polymer refractive index, and wherein the liquid refractive index is different than the polymer refractive index. 26. The structure of claim 25, wherein the first visible light transmission at a wavelength of about 400 nm to about 700 nm is greater than or equal to 85% as measured in accordance with ISO 9050, and the first direct solar light transmission is about 63% to about 70% as determined in accordance with ISO 9050. 27. The structure of claim 25, wherein the structure is selected from the group consisting of greenhouse, sun-room, and pool enclosure. 28. The structure of claim 27, wherein the structure is a greenhouse.