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A collapsible three-wheeled stroller for transporting a child includes a frame movable between folded and unfolded conditions, a handle mounted on an upper portion of the frame for pushing the stroller, one front wheel and two rear wheels rotatably mounted on a lower portion of the frame, and a seat

A collapsible three-wheeled stroller for transporting a child includes a frame movable between folded and unfolded conditions, a handle mounted on an upper portion of the frame for pushing the stroller, one front wheel and two rear wheels rotatably mounted on a lower portion of the frame, and a seat on the frame for supporting a child. The frame is constructed from a plurality of articulated frame members movable from the unfolded condition to the folded condition with accompanying motion of the rear wheels toward one another and a generally forward and downward motion of the handle.

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A collapsible three-wheeled stroller for transporting a child includes a frame movable between folded and unfolded conditions, a handle mounted on an upper portion of the frame for pushing the stroller, one front wheel and two rear wheels rotatably mounted on a lower portion of the frame, and a seat

A collapsible three-wheeled stroller for transporting a child includes a frame movable between folded and unfolded conditions, a handle mounted on an upper portion of the frame for pushing the stroller, one front wheel and two rear wheels rotatably mounted on a lower portion of the frame, and a seat on the frame for supporting a child. The frame is constructed from a plurality of articulated frame members movable from the unfolded condition to the folded condition with accompanying motion of the rear wheels toward one another and a generally forward and downward motion of the handle. tal remains in a liquid state and does not significantly vaporize at a temperature within said range. 15. The method of claim 14, wherein the biological/chemical samples in one or more containers are moved manually to contact the liquid metal. 16. The method of claim 14, wherein a robotic arm moves the biological/samples in one or more containers to contact the liquid metal. 17. The method of claim 14, wherein the predetermined temperatures for said containers are 30-65° C., 65-85° C. and 85-100° C., respectively. 18. A method of varying the temperature of a biological/chemical sample, comprising: (a) incubating a container containing the biological/chemical sample in liquid metal at a first pre-determined temperature for a given time period; and (b) incubating the container containing the biological/chemical sample in liquid metal at a second pre-determined temperature which is different from the first pre-determined temperature. 19. The method of claim 18, wherein the temperature change is affected by replacing liquid metal at the first predetermined temperature with liquid metal at the second predetermined temperature. 20. The method of claim 19, wherein the liquid metal is replaced by moving using magnetohydrodynamics. 21. The method of claim 20, wherein the magnetohydrodynamics is in AC mode. 22. The method of claim 20, wherein the magnetohydrodynamics is in DC mode. 23. The method of claim 19, wherein the liquid metal is moved by a pump. 24. The method of claim 19 wherein gravity is used to move the liquid metal. 25. The method of claim 18 wherein the liquid metal is a gallium-indium alloy. 26. The method of claim 25 wherein the gallium-indium alloy comprises 75.5% gallium and 24.5% indium. 27. A method of carrying out polymerase chain reaction (PCR), wherein one PCR cycle comprises: denaturing a polynucleotide sample in thermal contact with liquid metal at a temperature of about 90-98° C. for about 10-90 seconds; hybridizing oligonucleotide primers to the denatured polynucleotide sample in thermal contact with liquid metal at a temperature of about 30-65° C. for about 1-2 minutes; and synthesizing a new polynucleotide strand incorporating the oligonucleotide primer and using the denatured polynucleotide sample as a template for a polymerase in thermal contact with liquid metal at a temperature of about 70-75° C. for about 30 seconds to 5 minutes. 28. An apparatus for temperature control of samples, comprising: at least one container containing liquid metal, said container having an upper open area where the liquid metal thermally contacts one or more of the samples for temperature control thereof; and a temperature control device for heating the liquid metal, whereby said liquid metal remains in a liquid state and does not significantly evaporate during heating, and wherein said container containing liquid metal is a plastic container. 29. An apparatus for temperature control of samples, comprising: at least one container containing liquid metal, said container having an upper open area where the liquid metal thermally contacts one or more of the samples for temperature control thereof; and a temperature control device for heating the liquid metal whereby said liquid metal remains in a liquid state and does not significantly evaporate during heating, wherein said liquid metal is a gallium-indium alloy. 30. The apparatus of claim 29, wherein the gallium-indium alloy comprises 75.5% gallium and 24.5% indium. 31. An apparatus for temperature control of samples, comprising a plurality of containers containing liquid metal and at least one sample container, wherein at least one container containing liquid metal having an upper open area where the liquid metal thermally contacts one or more of the sample containers for temperature control thereof; a temperature control device for heating the liquid metal, whereby said liquid metal remains in a liquid state and does not significantly evaporat e during heating, and a robotic arm for moving the sample containers between the plurality of containers containing liquid metal. 32. The apparatus for temperature control of samples, comprising: at least one container containing liquid metal, said container having an upper open area where the liquid metal thermally contacts one or more of the samples for temperature control thereof; and a temperature control device for heating the liquid metal, whereby said liquid metal remains in a liquid state and does not significantly evaporate during heating, wherein the liquid metal is moved throughout the container by magnetohydrodynamics. 33. An apparatus for temperature control of samples, comprising: at least one container containing liquid metal, said container having an upper open area where the liquid metal thermally contacts one or more of the samples for temperature control thereof; and a temperature control device for heating the liquid metal, whereby said liquid metal remains in a liquid state and does not significantly evaporate during heating, and wherein a plurality of containers containing liquid metal are operably linked to a robotic liquid handler and dispenser. 34. The apparatus of claim 33, wherein three containers containing liquid metal are maintained at 30-65° C., 65-85° C. and 85-100° C., respectively. 35. A method of incubating one or more biological/chemical samples at a predetermined temperature comprising contacting the one or more biological/chemical samples with a container containing liquid metal at the predetermined temperature for a given time period, wherein a robotic arm moves the biological/chemical samples between a plurality of containers containing liquid metal. 36. The method of claim 35, wherein the predetermined temperatures for said plurality of containers are 30-65° C., 65-85° C. and 85-100° C., respectively. 37. A method of varying the temperature of a sample in a single container, comprising: (a) incubating a biological/chemical sample in contact with a container containing liquid metal at a first predetermined temperature for a given time period; (b) changing the temperature of the liquid metal to a second predetermined temperature which is different from the predetermined temperature of step (a); (c) repeating steps (a) and (b) until all desired incubations have occurred; and wherein the temperature change is affected by replacing liquid metal at the first predetermined temperature with liquid metal at the second predetermined temperature, and wherein the liquid metal is moved throughout the container containing liquid metal by magnetohydrodynamics. 38. The method of claim 37, wherein the magnetohydrodynamics is in AC mode. 39. The method of claim 37, wherein the magnetohydrodynamics is in DC mode. 40. A method of varying the temperature of a sample in a single container, comprising: (a) incubating a biological/chemical sample in contact with a container containing liquid metal at a first predetermined temperature for a given time period; (b) changing the temperature of the liquid metal to a second predetermined temperature which is different from the predetermined temperature of step (a); (c) repeating steps (a) and (b) until all desired incubations have occurred; and wherein the liquid metal is a gallium-indium alloy. 41. The method of claim 40, wherein the gallium-indium alloy comprises 75.5% gallium and 24.5% indium. 42. The method of claim 18, wherein the incubating at the first pre-determined temperature and the incubating at the second pre-determined temperature are performed in a single liquid metal bath, said method additionally comprising changing the temperature of the liquid metal in said container from the first pre-determined temperature to the second pre-determined temperature between the incubating at the first temperature and the incubating at the second temperature.