Top 100 presentations

1. Continuous Verb Tenses
   35441
2. Support and transport in plants
   33928
3. Anyong Tubig Anyong Lupa sa Asya
   29388
4. Elements compounds and mixtures
   26095
5. Chromosome
   22133
6. Simple Verb Tenses
   20831
7. Atomic Structure
   20334
8. Balancing Chemical Equations. Balancing redox equations
   20203
9. Periodic Behavior
   19954
10. Newton’s laws of motion
    18934
11. Periodic Trends
    16778
12. Adverbs
    16663
13. Percent Composition, Empirical and Molecular Formulas
    16018
14. Animal Farm
    15843
15. Bonding, Molecular Shape & Structure
    14795
16. Circulation and Gas Exchange
    13542
17. MakingFood
    13454
18. DNA - An overview
    13154
19. Atomic Structure and Periodic Trends
    12957
20. Fungi
    12922
21. Volumetric
    12720
22. Feminism- Cure or Curse
    12579
23. Atomic Structure and Periodicity
    12558
24. Hormones and the Endocrine System
    12250
25. Animal Development
    12180
26. Derivation Applications of Bernoulli Principal
    11949
27. Osmoregulation and Excretion
    11557
28. Plasma Membrane-Gateway to the Cell
    10832
29. Plant Structure, Growth, and Development
    10808
30. Acid, bases and salts
    10357
31. Development
    10274
32. Mirrors and Lenses
    10214
33. Structure of the Atom
    9965
34. Balanced forces
    9956
35. Ancient Civilizations
    9858
36. Mass Spectrometry
    9786
37. Pronouns
    9762
38. Nouns
    9718
39. Resource Acquisition and Transport in Vascular Plants
    9569
40. Forests
    9409
41. Support and transport in plants
    9409
42. Atomic Structure
    9337
43. Cell Types and Cell Structure
    9006
44. Newton’s third law of motion
    8976
45. Animal Nutrition
    8780
46. Transplantation Immunology
    8669
47. Cellular respiration
    8535
48. Sensory and Motor Mechanisms
    8418
49. Growing Plants
    8409
50. Electrical Circuits
    8281
51. Plant Responses to Internal and External Signals
    8278
52. Lab Equipment
    8068
53. Prepositions
    8007
54. Neurons, Synapses, and Signaling
    7959
55. Viruses, Viroids, and Prions
    7921
56. Of Mice and Men
    7869
57. A Tour of the Cell
    7803
58. Basic Structure of a Cell
    7684
59. Real time PCR and it's functions in diagnosis
    7659
60. Covalent Bonding (Molecules)
    7607
61. Plant structure adaptations and responses
    7566
62. Cellular Division
    7475
63. Ionic Bonding
    7473
64. Mendelian Genetics
    7129
65. To Kill a Mockingbird
    7112
66. Satellite Orbits and Uses NIS
    7067
67. Blood Type Genetics
    7057
68. Sound
    7011
69. Molecules and Ions
    6937
70. Well logging The Bore Hole
    6932
71. The Immune System
    6905
72. Membrane Structure and Function
    6840
73. Animal Reproduction
    6779
74. Angiosperm Reproduction and Biotechnology
    6719
75. The Chemistry of Acids and Bases
    6712
76. Plant Diversity
    6642
77. Mendel and the Gene Idea
    6640
78. Rocks
    6632
79. Cell Communication
    6614
80. Balancing Chemical Equations
    6521
81. Rate Laws
    6394
82. Introduction to Oscillations and Simple Harmonic Motion
    6364
83. Drama
    6353
84. Hybridization of Orbitals
    6338
85. The Building Blocks of Matter Atoms
    6285
86. Empirical Formula
    6228
87. An Introduction to Metabolism
    6208
88. Electron Quantum Numbers
    6197
89. Translation. Protein from RNA
    6106
90. Neurons
    6068
91. The Structure and Function of Large Biological Molecules
    6049
92. Photosynthesis
    5968
93. The Mole
    5923
94. Cell Membrane + Tissues & Organs Definitions
    5908
95. Earthquakes
    5860
96. Karyotypes
    5853
97. ADP, ATP and Cellular Respiration
    5820
98. Endocrine System
    5764
99. Classical greek philosophy
    5727
100. Population Ecology
     5707

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)