Top 100 presentations

1. Continuous Verb Tenses
   35346
2. Support and transport in plants
   33838
3. Anyong Tubig Anyong Lupa sa Asya
   29303
4. Elements compounds and mixtures
   26021
5. Chromosome
   22005
6. Simple Verb Tenses
   20793
7. Atomic Structure
   20228
8. Balancing Chemical Equations. Balancing redox equations
   20136
9. Periodic Behavior
   19894
10. Newton’s laws of motion
    18871
11. Periodic Trends
    16752
12. Adverbs
    16643
13. Percent Composition, Empirical and Molecular Formulas
    15980
14. Animal Farm
    15791
15. Bonding, Molecular Shape & Structure
    14734
16. Circulation and Gas Exchange
    13433
17. MakingFood
    13399
18. DNA - An overview
    13067
19. Fungi
    12876
20. Atomic Structure and Periodic Trends
    12867
21. Volumetric
    12669
22. Feminism- Cure or Curse
    12550
23. Atomic Structure and Periodicity
    12506
24. Hormones and the Endocrine System
    12140
25. Animal Development
    12070
26. Derivation Applications of Bernoulli Principal
    11902
27. Osmoregulation and Excretion
    11483
28. Plasma Membrane-Gateway to the Cell
    10787
29. Plant Structure, Growth, and Development
    10718
30. Acid, bases and salts
    10266
31. Development
    10210
32. Mirrors and Lenses
    10143
33. Structure of the Atom
    9932
34. Balanced forces
    9904
35. Ancient Civilizations
    9820
36. Mass Spectrometry
    9760
37. Pronouns
    9733
38. Nouns
    9676
39. Resource Acquisition and Transport in Vascular Plants
    9496
40. Forests
    9388
41. Support and transport in plants
    9351
42. Atomic Structure
    9301
43. Cell Types and Cell Structure
    8987
44. Newton’s third law of motion
    8930
45. Animal Nutrition
    8694
46. Transplantation Immunology
    8632
47. Cellular respiration
    8505
48. Growing Plants
    8362
49. Sensory and Motor Mechanisms
    8331
50. Electrical Circuits
    8252
51. Plant Responses to Internal and External Signals
    8185
52. Lab Equipment
    8031
53. Prepositions
    7983
54. Viruses, Viroids, and Prions
    7886
55. Neurons, Synapses, and Signaling
    7867
56. Of Mice and Men
    7814
57. A Tour of the Cell
    7723
58. Basic Structure of a Cell
    7659
59. Real time PCR and it's functions in diagnosis
    7614
60. Covalent Bonding (Molecules)
    7585
61. Plant structure adaptations and responses
    7541
62. Ionic Bonding
    7453
63. Cellular Division
    7432
64. Mendelian Genetics
    7087
65. To Kill a Mockingbird
    7064
66. Blood Type Genetics
    7022
67. Satellite Orbits and Uses NIS
    7022
68. Molecules and Ions
    6920
69. Well logging The Bore Hole
    6903
70. Sound
    6903
71. The Immune System
    6829
72. Membrane Structure and Function
    6765
73. Animal Reproduction
    6717
74. The Chemistry of Acids and Bases
    6662
75. Angiosperm Reproduction and Biotechnology
    6657
76. Rocks
    6606
77. Mendel and the Gene Idea
    6588
78. Plant Diversity
    6586
79. Cell Communication
    6545
80. Balancing Chemical Equations
    6491
81. Rate Laws
    6359
82. Drama
    6323
83. Hybridization of Orbitals
    6312
84. Introduction to Oscillations and Simple Harmonic Motion
    6312
85. The Building Blocks of Matter Atoms
    6238
86. Empirical Formula
    6212
87. Electron Quantum Numbers
    6170
88. An Introduction to Metabolism
    6139
89. Translation. Protein from RNA
    6089
90. Neurons
    6031
91. The Structure and Function of Large Biological Molecules
    5972
92. The Mole
    5906
93. Photosynthesis
    5904
94. Cell Membrane + Tissues & Organs Definitions
    5875
95. Earthquakes
    5838
96. Karyotypes
    5833
97. ADP, ATP and Cellular Respiration
    5803
98. Endocrine System
    5753
99. Classical greek philosophy
    5694
100. Population Ecology
     5650

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