Abstract: An interactive infant simulation device used to demonstrate the proper sleep position of an infant. The infant simulation device can include an infant body portion and a transparent upper respiratory passageway at least partially contained within the infant body portion. The infant body portion can include one or two parts, and the two parts can be removeably coupled to one another. The infant simulation device can be moved from a first position to a second position, and a colored fluid contained within the upper respiratory passageway can be viewed moving between passages representing the trachea, esophagus, and pharynx of an infant. In one case (e.g., a stomach-down orientation), the fluid may be present in the tracheal passage, demonstrating the improper sleep position of an infant. In another case (e.g., a back-down orientation), the tracheal passage may be substantially free from fluid, demonstrating the proper sleep position of an infant.

Abstract: A lever system teaching tool includes a frame and an elongate member that is releasably coupled to the frame. The elongate member defines a plurality of mounting stations along its length. The elongate member can be pivotally or rotatably coupled to the fulcrum of the frame at any of the mounting stations. The elongate member includes repositories at opposite ends of the elongate member. The repositories are sized and shaped to retain one or more incremental loads.

Abstract: Apparatus and method for simultaneously lifting and placing weights. The apparatus includes a support with a first arm and a second arm extending from the support. Weight supports are arranged at distal ends of the arms. The arms are movable to position weights supported by the weight supports. The apparatus also includes a lifting apparatus operable to selectively raise and lower the support. An operator can articulate the arms to storage locations of weights. The operator can then operate the lifting apparatus to raise the support and lift the weights. The operator can then articulate the arms to move the lifted weights to weight placement locations. The operator can then operate the lifting apparatus to lower the support and place the weights on the weight placement locations.

Abstract: A teaching device used for teaching mathematical operations that includes: a support defining a fulcrum axis, a lever-like member, a plurality of objects and optionally a cradle. The lever-like member is pivotably supported about the fulcrum axis and has a surface facing upwardly with a plurality of weight stations equidistantly disposed along the length at measured intervals that are assigned numeric values. Each of the objects has a weight that is assigned a numerical value. One or more of the objects can be positioned on the weight stations on each of the first and second ends of the lever-like member. The moments for the first and second ends about the fulcrum are the sum of the products of the weight value and distance from the fulcrum axis for each weight. The lever-like member is in equilibrium when the first moment is equal to the second moment.

Abstract: A system and method for determining area of irregular or complex shapes for easily determining area of complex shapes. The system and method for determining area of irregular or complex shapes includes comprises a quantity of tracing paper for capturing a two dimensional representation of the irregular shape, a quantity of a substrate having a known weight per unit of area, the substrate being for receiving a two dimensional representation of the irregular shape transferred from the tracing paper, and a scale for determining a weight of a two dimensional representation cut from said substrate.

Abstract: A teach-aiding weight set includes a white, a red, a light green, a purple, a yellow, a green, a black, a brown, a blue, and an orange weight. Each of the weights is provided with spaced shallow grooves to show a plurality of equal sections corresponding to a specific weight thereof. The specific color, weight, and shallow-groove-divided sections of each of the weights help small children to learn primary mathematical concepts, particularly the concept of weight.

Abstract: Engineered protein kinases which can utilize modified nucleotide triphosphate substrates that are not as readily utilized by the wild-type forms of those enzymes, and methods of making and using them. Modified nucleotide triphosphate substrates and methods of making and using them. Methods for using such engineered kinases and such modified substrates to identify which protein substrates the kinases act upon, to measure the extent of such action, and to determine if test compounds can modulate such action. Also engineered forms of multi-substrate enzymes which covalently attach part or all of at least one (donor) substrate to at least one other (recipient) substrate, which engineered forms will accept modified substrates that are not as readily utilized by the wild-type forms of those enzymes. Methods for making and using such engineered enzymes. Modified substrates and methods of making and using them.

Abstract: The teaching aid apparatus provides two balance beams (27, 28), one above the other, on a support post (23). Weight-attachment stations (36) are provided on the left and right arms of both beams, and the stations are marked on the beams with numerals indicative of distance of the station from the beam fulcrum. The beams are connected by means of pinions (32, 34), which constrain the beams to tip in unison in response to unbalance of one beam. The apparatus aids the demonstration of negative concepts to young children.

Abstract: The seesaw device is adjustable as to the lengths of the moment arms on the beam, of the two seats. Children can adjust the moment-arm length of their own seat in order to compensate for weight imbalances between them. A visible display scale informs of the child of the current moment arm setting.

Abstract: A four-pan algebra balance includes an imbalance correction mechanism for maintaining a balance beam in a horizontal equilibrium position unless the imbalance between the two sides of the device exceeds a predetermined amount. The balance includes a base, an upright stand mounted to, and extending substantially vertically from the base, a crossbar mounted to an upper end of the stand so as to extend substantially horizontally and the balance beam pivotally coupled to a midpoint of the stand. A first weight receptacle subassembly including two pans is coupled to a first end of the crossbar and a first end of the balance beam and a second weight receptacle subassembly including two pans is coupled to a second end of the crossbar and a second end of the balance beam. A visual indicator provides an indication of the relative equality of the first and second weight receptacle subassemblies.

Abstract: A teaching aid computer, requiring no electrical or spring power, designed for elementary and middle school students, that when properly set and manipulated, provides real number solutions to equations involving multiple degree, as well as single degree unknowns. Parallel, interconnecting balancing beams are marked so as to provide adjustable positions for weights, whose resultant torques represent equation constants and coefficients of each degree of the unknown quantity. Further, by positioning and clamping movable axes beams, students can see and feel the results of adding or subtracting a few, or a series of numbers. Also, sliding beams, as well as sliding weights captively located in channels of each beam, with no required extra loose weights, allow simple decimal settings and answers to equations involving multiplication, and division.

Abstract: A toy balance concept-developing device for helping children to develop a concept of balance, including a housing, a beam, a positioning means, a model and a number of plastic weights. Owing to the weight difference between the weight on two distal end of the beam, the beam is rotatable to activate the pointer to indicate if the beam is in balance.

Abstract: A financial instrument has an amount printed on its face in which the digits making up the amount are printed in a negative pattern. The digits are formed by a series of rows of printed dots which define the outlines of the digits. To make alteration of the amount more difficult, each of the digits includes a boundary portion formed by a single row of dots which makes up a portion of the outline of each of the adjoining digits.

Abstract: A balance for teaching arithmetic principles has a balance arm pivotal about a central horizontal pivot axis coincident with the axis of a support rod supported in openings at the top of opposed vertical upstanding members of a support. The balance arm has a central rectangular housing and end rectangular housings at each end extending upward carrying vertical calibrations at intervals corresponding to the height of annular washers that balance the arm. A number of upstanding vertical pins similarly vertically calibrated are spaced at one-inch intervals on either side of the pivot axis at horizontal locations on the arm along respective horizontal calibration indicia of diameter corresponding substantially to the diameter of the central openings in the washers. The front face of the balance arm is transparent along its length for exposing scales on a central mandrel carrying a number of scales that may be rotated to expose a selected scale.

Abstract: The present educational amusement device includes a horizontally pivoted balance arm and several pairs of matched game pieces. The game pieces of each pair include one which displays a non-verbal symbol and another one which displays the word for that symbol. The game pieces of each pair are equal in weight to each other but different in weight from the game pieces of every other pair. Therefore, the balance arm will assume a horizontal position only if two game pieces placed on it belong to the same pair. A downwardly extending front wall of the balance arm presents a window which registers with and fully uncovers a smiling face symbol on the pivotal support for the balance arm only when the balance arm is horizontal.