Top 100 presentations

1. Continuous Verb Tenses
   35319
2. Support and transport in plants
   33803
3. Anyong Tubig Anyong Lupa sa Asya
   29290
4. Elements compounds and mixtures
   26001
5. Chromosome
   21986
6. Simple Verb Tenses
   20789
7. Atomic Structure
   20213
8. Balancing Chemical Equations. Balancing redox equations
   20121
9. Periodic Behavior
   19882
10. Newton’s laws of motion
    18852
11. Periodic Trends
    16746
12. Adverbs
    16635
13. Percent Composition, Empirical and Molecular Formulas
    15971
14. Animal Farm
    15775
15. Bonding, Molecular Shape & Structure
    14720
16. Circulation and Gas Exchange
    13418
17. MakingFood
    13392
18. DNA - An overview
    13048
19. Fungi
    12869
20. Atomic Structure and Periodic Trends
    12832
21. Volumetric
    12657
22. Feminism- Cure or Curse
    12545
23. Atomic Structure and Periodicity
    12496
24. Hormones and the Endocrine System
    12127
25. Animal Development
    12042
26. Derivation Applications of Bernoulli Principal
    11894
27. Osmoregulation and Excretion
    11462
28. Plasma Membrane-Gateway to the Cell
    10782
29. Plant Structure, Growth, and Development
    10706
30. Acid, bases and salts
    10241
31. Development
    10200
32. Mirrors and Lenses
    10129
33. Structure of the Atom
    9924
34. Balanced forces
    9895
35. Ancient Civilizations
    9814
36. Mass Spectrometry
    9753
37. Pronouns
    9729
38. Nouns
    9674
39. Resource Acquisition and Transport in Vascular Plants
    9486
40. Forests
    9377
41. Support and transport in plants
    9342
42. Atomic Structure
    9296
43. Cell Types and Cell Structure
    8985
44. Newton’s third law of motion
    8922
45. Animal Nutrition
    8683
46. Transplantation Immunology
    8624
47. Cellular respiration
    8501
48. Growing Plants
    8352
49. Sensory and Motor Mechanisms
    8318
50. Electrical Circuits
    8247
51. Plant Responses to Internal and External Signals
    8150
52. Lab Equipment
    8027
53. Prepositions
    7978
54. Viruses, Viroids, and Prions
    7878
55. Neurons, Synapses, and Signaling
    7856
56. Of Mice and Men
    7806
57. A Tour of the Cell
    7706
58. Basic Structure of a Cell
    7655
59. Real time PCR and it's functions in diagnosis
    7603
60. Covalent Bonding (Molecules)
    7581
61. Plant structure adaptations and responses
    7534
62. Ionic Bonding
    7445
63. Cellular Division
    7427
64. Mendelian Genetics
    7081
65. To Kill a Mockingbird
    7051
66. Blood Type Genetics
    7017
67. Satellite Orbits and Uses NIS
    7015
68. Molecules and Ions
    6917
69. Well logging The Bore Hole
    6897
70. Sound
    6878
71. The Immune System
    6818
72. Membrane Structure and Function
    6745
73. Animal Reproduction
    6710
74. The Chemistry of Acids and Bases
    6658
75. Angiosperm Reproduction and Biotechnology
    6647
76. Rocks
    6602
77. Mendel and the Gene Idea
    6580
78. Plant Diversity
    6573
79. Cell Communication
    6525
80. Balancing Chemical Equations
    6485
81. Rate Laws
    6356
82. Drama
    6316
83. Hybridization of Orbitals
    6306
84. Introduction to Oscillations and Simple Harmonic Motion
    6303
85. The Building Blocks of Matter Atoms
    6229
86. Empirical Formula
    6210
87. Electron Quantum Numbers
    6162
88. An Introduction to Metabolism
    6128
89. Translation. Protein from RNA
    6083
90. Neurons
    6028
91. The Structure and Function of Large Biological Molecules
    5957
92. The Mole
    5903
93. Photosynthesis
    5893
94. Cell Membrane + Tissues & Organs Definitions
    5870
95. Earthquakes
    5832
96. Karyotypes
    5830
97. ADP, ATP and Cellular Respiration
    5796
98. Endocrine System
    5752
99. Classical greek philosophy
    5685
100. Population Ecology
     5648

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