Top 100 presentations

1. Continuous Verb Tenses
   35332
2. Support and transport in plants
   33820
3. Anyong Tubig Anyong Lupa sa Asya
   29296
4. Elements compounds and mixtures
   26006
5. Chromosome
   21990
6. Simple Verb Tenses
   20790
7. Atomic Structure
   20217
8. Balancing Chemical Equations. Balancing redox equations
   20128
9. Periodic Behavior
   19889
10. Newton’s laws of motion
    18858
11. Periodic Trends
    16748
12. Adverbs
    16637
13. Percent Composition, Empirical and Molecular Formulas
    15972
14. Animal Farm
    15777
15. Bonding, Molecular Shape & Structure
    14727
16. Circulation and Gas Exchange
    13423
17. MakingFood
    13393
18. DNA - An overview
    13057
19. Fungi
    12872
20. Atomic Structure and Periodic Trends
    12841
21. Volumetric
    12661
22. Feminism- Cure or Curse
    12549
23. Atomic Structure and Periodicity
    12500
24. Hormones and the Endocrine System
    12131
25. Animal Development
    12048
26. Derivation Applications of Bernoulli Principal
    11897
27. Osmoregulation and Excretion
    11471
28. Plasma Membrane-Gateway to the Cell
    10783
29. Plant Structure, Growth, and Development
    10710
30. Acid, bases and salts
    10256
31. Development
    10203
32. Mirrors and Lenses
    10130
33. Structure of the Atom
    9928
34. Balanced forces
    9896
35. Ancient Civilizations
    9818
36. Mass Spectrometry
    9757
37. Pronouns
    9730
38. Nouns
    9674
39. Resource Acquisition and Transport in Vascular Plants
    9491
40. Forests
    9378
41. Support and transport in plants
    9347
42. Atomic Structure
    9299
43. Cell Types and Cell Structure
    8986
44. Newton’s third law of motion
    8924
45. Animal Nutrition
    8689
46. Transplantation Immunology
    8629
47. Cellular respiration
    8502
48. Growing Plants
    8355
49. Sensory and Motor Mechanisms
    8324
50. Electrical Circuits
    8249
51. Plant Responses to Internal and External Signals
    8171
52. Lab Equipment
    8030
53. Prepositions
    7980
54. Viruses, Viroids, and Prions
    7880
55. Neurons, Synapses, and Signaling
    7861
56. Of Mice and Men
    7809
57. A Tour of the Cell
    7713
58. Basic Structure of a Cell
    7657
59. Real time PCR and it's functions in diagnosis
    7604
60. Covalent Bonding (Molecules)
    7583
61. Plant structure adaptations and responses
    7536
62. Ionic Bonding
    7447
63. Cellular Division
    7430
64. Mendelian Genetics
    7084
65. To Kill a Mockingbird
    7058
66. Blood Type Genetics
    7020
67. Satellite Orbits and Uses NIS
    7017
68. Molecules and Ions
    6917
69. Well logging The Bore Hole
    6897
70. Sound
    6886
71. The Immune System
    6827
72. Membrane Structure and Function
    6757
73. Animal Reproduction
    6715
74. The Chemistry of Acids and Bases
    6659
75. Angiosperm Reproduction and Biotechnology
    6649
76. Rocks
    6604
77. Mendel and the Gene Idea
    6584
78. Plant Diversity
    6577
79. Cell Communication
    6532
80. Balancing Chemical Equations
    6486
81. Rate Laws
    6356
82. Drama
    6320
83. Introduction to Oscillations and Simple Harmonic Motion
    6308
84. Hybridization of Orbitals
    6307
85. The Building Blocks of Matter Atoms
    6234
86. Empirical Formula
    6211
87. Electron Quantum Numbers
    6166
88. An Introduction to Metabolism
    6128
89. Translation. Protein from RNA
    6084
90. Neurons
    6030
91. The Structure and Function of Large Biological Molecules
    5965
92. The Mole
    5906
93. Photosynthesis
    5895
94. Cell Membrane + Tissues & Organs Definitions
    5873
95. Earthquakes
    5834
96. Karyotypes
    5830
97. ADP, ATP and Cellular Respiration
    5798
98. Endocrine System
    5752
99. Classical greek philosophy
    5687
100. Population Ecology
     5648

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