Top 100 presentations

1. Continuous Verb Tenses
   35492
2. Support and transport in plants
   33955
3. Anyong Tubig Anyong Lupa sa Asya
   29500
4. Elements compounds and mixtures
   26126
5. Chromosome
   22227
6. Simple Verb Tenses
   20857
7. Atomic Structure
   20380
8. Balancing Chemical Equations. Balancing redox equations
   20249
9. Periodic Behavior
   19969
10. Newton’s laws of motion
    18985
11. Periodic Trends
    16789
12. Adverbs
    16675
13. Percent Composition, Empirical and Molecular Formulas
    16036
14. Animal Farm
    15872
15. Bonding, Molecular Shape & Structure
    14828
16. Circulation and Gas Exchange
    13588
17. MakingFood
    13483
18. DNA - An overview
    13212
19. Atomic Structure and Periodic Trends
    13010
20. Fungi
    12944
21. Volumetric
    12755
22. Feminism- Cure or Curse
    12587
23. Atomic Structure and Periodicity
    12587
24. Hormones and the Endocrine System
    12304
25. Animal Development
    12231
26. Derivation Applications of Bernoulli Principal
    11959
27. Osmoregulation and Excretion
    11598
28. Plasma Membrane-Gateway to the Cell
    10862
29. Plant Structure, Growth, and Development
    10848
30. Acid, bases and salts
    10396
31. Development
    10304
32. Mirrors and Lenses
    10242
33. Structure of the Atom
    9991
34. Balanced forces
    9976
35. Ancient Civilizations
    9882
36. Mass Spectrometry
    9798
37. Pronouns
    9776
38. Nouns
    9735
39. Resource Acquisition and Transport in Vascular Plants
    9658
40. Support and transport in plants
    9429
41. Forests
    9427
42. Atomic Structure
    9362
43. Newton’s third law of motion
    9021
44. Cell Types and Cell Structure
    9018
45. Animal Nutrition
    8820
46. Transplantation Immunology
    8692
47. Cellular respiration
    8552
48. Sensory and Motor Mechanisms
    8459
49. Growing Plants
    8435
50. Plant Responses to Internal and External Signals
    8327
51. Electrical Circuits
    8299
52. Lab Equipment
    8098
53. Prepositions
    8016
54. Neurons, Synapses, and Signaling
    7993
55. Viruses, Viroids, and Prions
    7942
56. Of Mice and Men
    7883
57. A Tour of the Cell
    7865
58. Basic Structure of a Cell
    7708
59. Real time PCR and it's functions in diagnosis
    7675
60. Covalent Bonding (Molecules)
    7621
61. Plant structure adaptations and responses
    7579
62. Cellular Division
    7504
63. Ionic Bonding
    7481
64. Mendelian Genetics
    7150
65. To Kill a Mockingbird
    7130
66. Satellite Orbits and Uses NIS
    7093
67. Sound
    7078
68. Blood Type Genetics
    7068
69. Well logging The Bore Hole
    6959
70. Molecules and Ions
    6949
71. The Immune System
    6948
72. Membrane Structure and Function
    6870
73. Animal Reproduction
    6808
74. The Chemistry of Acids and Bases
    6792
75. Angiosperm Reproduction and Biotechnology
    6747
76. Mendel and the Gene Idea
    6686
77. Plant Diversity
    6685
78. Cell Communication
    6648
79. Rocks
    6644
80. Balancing Chemical Equations
    6539
81. Rate Laws
    6407
82. Introduction to Oscillations and Simple Harmonic Motion
    6382
83. Drama
    6366
84. Hybridization of Orbitals
    6350
85. The Building Blocks of Matter Atoms
    6309
86. An Introduction to Metabolism
    6251
87. Empirical Formula
    6242
88. Electron Quantum Numbers
    6212
89. Translation. Protein from RNA
    6110
90. Neurons
    6084
91. The Structure and Function of Large Biological Molecules
    6078
92. Photosynthesis
    6015
93. The Mole
    5934
94. Cell Membrane + Tissues & Organs Definitions
    5920
95. Earthquakes
    5878
96. Karyotypes
    5858
97. ADP, ATP and Cellular Respiration
    5833
98. Endocrine System
    5768
99. Classical greek philosophy
    5749
100. Population Ecology
     5744

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